AK: Remove URL::ApplyPercentEncoding

Everywhere only ever expects percent encoding to occur, so let's just
remove this flag altogether. At the same time, replace some
DeprecatedString with StringView.

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -506,7 +506,7 @@ WebIDL::ExceptionOr<Document*> Document::open(DeprecatedString const&, Deprecate
         auto new_url = entry_document.url();
         // 2. If entryDocument is not document, then set newURL's fragment to null.
         if (&entry_document != this)
-            new_url.set_fragment("");
+            new_url.set_fragment({});
 
         // FIXME: 3. Run the URL and history update steps with document and newURL.
     }

Userland/Libraries/LibWeb/HTML/Location.cpp

@@ -309,7 +309,7 @@ WebIDL::ExceptionOr<void> Location::set_hash(String const& value)
     auto input = value.bytes_as_string_view().trim("#"sv, TrimMode::Left);
 
     // 5. Set copyURL's fragment to the empty string.
-    copy_url.set_fragment("");
+    copy_url.set_fragment(""sv);
 
     // 6. Basic URL parse input, with copyURL as url and fragment state as state override.
     auto result_url = URLParser::basic_parse(input, {}, copy_url, URLParser::State::Fragment);

Userland/Libraries/LibWeb/URL/URL.cpp

@@ -237,7 +237,7 @@ void URL::set_username(String const& username)
         return;
 
     // 2. Set the username given this’s URL and the given value.
-    m_url.set_username(username.to_deprecated_string(), AK::URL::ApplyPercentEncoding::Yes);
+    m_url.set_username(username);
 }
 
 // https://url.spec.whatwg.org/#dom-url-password
@@ -257,7 +257,7 @@ void URL::set_password(String const& password)
         return;
 
     // 2. Set the password given this’s URL and the given value.
-    m_url.set_password(password.to_deprecated_string(), AK::URL::ApplyPercentEncoding::Yes);
+    m_url.set_password(password);
 }
 
 // https://url.spec.whatwg.org/#dom-url-host

Userland/Libraries/LibWeb/URL/URL.h

@@ -65,7 +65,7 @@ public:
 
     WebIDL::ExceptionOr<String> to_json() const;
 
-    void set_query(Badge<URLSearchParams>, String query) { m_url.set_query(query.to_deprecated_string(), AK::URL::ApplyPercentEncoding::Yes); }
+    void set_query(Badge<URLSearchParams>, StringView query) { m_url.set_query(query); }
 
 private:
     URL(JS::Realm&, AK::URL, JS::NonnullGCPtr<URLSearchParams> query);