Ladybird+LibWebView: Move CookieJar, Database, and History to LibWebView

These classes are used as-is in all chromes. Move them to LibWebView so
that non-Serenity chromes don't have to awkwardly reach into its headers
and sources.

Userland/Libraries/LibWebView/History.cpp

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWebView/History.h>
+
+namespace WebView {
+
+void History::dump() const
+{
+    dbgln("Dump {} items(s)", m_items.size());
+    int i = 0;
+    for (auto& item : m_items) {
+        dbgln("[{}] {} '{}' {}", i, item.url, item.title, m_current == i ? '*' : ' ');
+        ++i;
+    }
+}
+
+Vector<History::URLTitlePair> History::get_all_history_entries()
+{
+    return m_items;
+}
+
+void History::push(const URL& url, DeprecatedString const& title)
+{
+    if (!m_items.is_empty() && m_items[m_current].url == url)
+        return;
+    m_items.shrink(m_current + 1);
+    m_items.append(URLTitlePair {
+        .url = url,
+        .title = title,
+    });
+    m_current++;
+}
+
+void History::replace_current(const URL& url, DeprecatedString const& title)
+{
+    if (m_current == -1)
+        return;
+
+    m_items.remove(m_current);
+    m_current--;
+    push(url, title);
+}
+
+History::URLTitlePair History::current() const
+{
+    if (m_current == -1)
+        return {};
+    return m_items[m_current];
+}
+
+void History::go_back(int steps)
+{
+    VERIFY(can_go_back(steps));
+    m_current -= steps;
+}
+
+void History::go_forward(int steps)
+{
+    VERIFY(can_go_forward(steps));
+    m_current += steps;
+}
+
+void History::clear()
+{
+    m_items = {};
+    m_current = -1;
+}
+
+void History::update_title(DeprecatedString const& title)
+{
+    if (m_current == -1)
+        return;
+    m_items[m_current].title = title;
+}
+
+Vector<StringView> const History::get_back_title_history()
+{
+    Vector<StringView> back_title_history;
+    for (int i = m_current - 1; i >= 0; i--) {
+        back_title_history.append(m_items[i].title);
+    }
+    return back_title_history;
+}
+
+Vector<StringView> const History::get_forward_title_history()
+{
+    Vector<StringView> forward_title_history;
+    for (int i = m_current + 1; i < static_cast<int>(m_items.size()); i++) {
+        forward_title_history.append(m_items[i].title);
+    }
+    return forward_title_history;
+}
+
+}