LibWeb: Rename Web::Frame to Web::BrowsingContext

Our "frame" concept very closely matches what the web specs call a
"browsing context", so let's rename it to that. :^)

The "main frame" becomes the "top-level browsing context",
and "sub-frames" are now "nested browsing contexts".

Userland/Libraries/LibWeb/HTML/FrameHostElement.cpp

@@ -8,7 +8,7 @@
 #include <LibWeb/DOM/Event.h>
 #include <LibWeb/HTML/FrameHostElement.h>
 #include <LibWeb/Origin.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::HTML {
 
@@ -26,18 +26,18 @@ void FrameHostElement::inserted()
     HTMLElement::inserted();
     if (!is_connected())
         return;
-    if (auto* frame = document().frame()) {
-        m_content_frame = Frame::create_subframe(*this, frame->main_frame());
-        m_content_frame->set_frame_nesting_levels(frame->frame_nesting_levels());
-        m_content_frame->register_frame_nesting(document().url());
+    if (auto* frame = document().browsing_context()) {
+        m_nested_browsing_context = BrowsingContext::create_nested(*this, frame->top_level_browsing_context());
+        m_nested_browsing_context->set_frame_nesting_levels(frame->frame_nesting_levels());
+        m_nested_browsing_context->register_frame_nesting(document().url());
     }
 }
 
 Origin FrameHostElement::content_origin() const
 {
-    if (!m_content_frame || !m_content_frame->document())
+    if (!m_nested_browsing_context || !m_nested_browsing_context->document())
         return {};
-    return m_content_frame->document()->origin();
+    return m_nested_browsing_context->document()->origin();
 }
 
 bool FrameHostElement::may_access_from_origin(const Origin& origin) const
@@ -47,10 +47,10 @@ bool FrameHostElement::may_access_from_origin(const Origin& origin) const
 
 const DOM::Document* FrameHostElement::content_document() const
 {
-    return m_content_frame ? m_content_frame->document() : nullptr;
+    return m_nested_browsing_context ? m_nested_browsing_context->document() : nullptr;
 }
 
-void FrameHostElement::content_frame_did_load(Badge<FrameLoader>)
+void FrameHostElement::nested_browsing_context_did_load(Badge<FrameLoader>)
 {
     dispatch_event(DOM::Event::create(EventNames::load));
 }

Userland/Libraries/LibWeb/HTML/FrameHostElement.h

@@ -15,20 +15,20 @@ public:
     FrameHostElement(DOM::Document&, QualifiedName);
     virtual ~FrameHostElement() override;
 
-    Frame* content_frame() { return m_content_frame; }
-    const Frame* content_frame() const { return m_content_frame; }
+    BrowsingContext* nested_browsing_context() { return m_nested_browsing_context; }
+    const BrowsingContext* nested_browsing_context() const { return m_nested_browsing_context; }
 
     const DOM::Document* content_document() const;
 
     Origin content_origin() const;
     bool may_access_from_origin(const Origin&) const;
 
-    void content_frame_did_load(Badge<FrameLoader>);
+    void nested_browsing_context_did_load(Badge<FrameLoader>);
 
     virtual void inserted() override;
 
 protected:
-    RefPtr<Frame> m_content_frame;
+    RefPtr<BrowsingContext> m_nested_browsing_context;
 };
 
 }

Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp

@@ -10,7 +10,7 @@
 #include <LibWeb/HTML/HTMLInputElement.h>
 #include <LibWeb/HTML/SubmitEvent.h>
 #include <LibWeb/InProcessWebView.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 #include <LibWeb/URLEncoder.h>
 
 namespace Web::HTML {

Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp

@@ -8,7 +8,7 @@
 #include <LibWeb/HTML/HTMLIFrameElement.h>
 #include <LibWeb/Layout/FrameBox.h>
 #include <LibWeb/Origin.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::HTML {
 
@@ -43,7 +43,7 @@ void HTMLIFrameElement::inserted()
 
 void HTMLIFrameElement::load_src(const String& value)
 {
-    if (!m_content_frame)
+    if (!m_nested_browsing_context)
         return;
 
     if (value.is_null())
@@ -60,7 +60,7 @@ void HTMLIFrameElement::load_src(const String& value)
     }
 
     dbgln("Loading iframe document from {}", value);
-    m_content_frame->loader().load(url, FrameLoader::Type::IFrame);
+    m_nested_browsing_context->loader().load(url, FrameLoader::Type::IFrame);
 }
 
 }

Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp

@@ -17,7 +17,7 @@
 #include <LibWeb/Layout/ButtonBox.h>
 #include <LibWeb/Layout/CheckBox.h>
 #include <LibWeb/Layout/RadioButton.h>
-#include <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/BrowsingContext.h>
 
 namespace Web::HTML {
 

Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp

@@ -23,7 +23,7 @@ void HTMLTitleElement::children_changed()
 {
     HTMLElement::children_changed();
     if (auto* page = document().page()) {
-        if (document().frame() == &page->main_frame())
+        if (document().browsing_context() == &page->top_level_browsing_context())
             page->client().page_did_change_title(document().title());
     }
 }