Add per-tab "JavaScript enabled" preference.

chrome/browser/ui/tab_contents/tab_contents_wrapper.h

Index: chrome/browser/ui/tab_contents/tab_contents_wrapper.h
diff --git a/chrome/browser/ui/tab_contents/tab_contents_wrapper.h b/chrome/browser/ui/tab_contents/tab_contents_wrapper.h
index 084429123e141daaeda942e97bd1ca352ae8fe11..be02509afaa2cfbd3c582b91ef4022eeaf9562e1 100644
--- a/chrome/browser/ui/tab_contents/tab_contents_wrapper.h
+++ b/chrome/browser/ui/tab_contents/tab_contents_wrapper.h
@@ -179,6 +179,8 @@ class TabContentsWrapper : public TabContentsObserver,
   InfoBarTabHelper* infobar_tab_helper() { return infobar_tab_helper_.get(); }
   PasswordManager* password_manager() { return password_manager_.get(); }
 
+  PrefService* per_tab_prefs() { return per_tab_prefs_.get(); }
+
   prerender::PrerenderTabHelper* prerender_tab_helper() {
     return prerender_tab_helper_.get();
   }
@@ -241,6 +243,8 @@ class TabContentsWrapper : public TabContentsObserver,
   // URL is empty, the default error page built into WebKit will be used.
   GURL GetAlternateErrorPageURL() const;
 
+  void RegisterPerTabUserPrefs(PrefService* prefs);
+
   // Send the alternate error page URL to the renderer.
   void UpdateAlternateErrorPageURL(RenderViewHost* rvh);
 
@@ -261,6 +265,7 @@ class TabContentsWrapper : public TabContentsObserver,
 
   content::NotificationRegistrar registrar_;
   PrefChangeRegistrar pref_change_registrar_;
+  PrefChangeRegistrar per_tab_pref_change_registrar_;
 
   // Helper which implements the SyncedTabDelegate interface.
   scoped_ptr<TabContentsWrapperSyncedTabDelegate> synced_tab_delegate_;
@@ -293,6 +298,9 @@ class TabContentsWrapper : public TabContentsObserver,
   scoped_ptr<PasswordManagerDelegate> password_manager_delegate_;
   scoped_ptr<PasswordManager> password_manager_;
 
+  // Allows overriding user preferences.
+  scoped_ptr<PrefService> per_tab_prefs_;
+
   scoped_ptr<prerender::PrerenderTabHelper> prerender_tab_helper_;
 
   // Handles print job for this contents.
@@ -324,7 +332,6 @@ class TabContentsWrapper : public TabContentsObserver,
   scoped_ptr<ExtensionWebNavigationTabObserver> webnavigation_observer_;
   scoped_ptr<ExternalProtocolObserver> external_protocol_observer_;
   scoped_ptr<PluginObserver> plugin_observer_;
-  scoped_ptr<PrefService> per_tab_prefs_; // Allows overriding user preferences.
   scoped_ptr<printing::PrintPreviewMessageHandler> print_preview_;
   scoped_ptr<SadTabObserver> sad_tab_observer_;
   scoped_ptr<ThumbnailGenerator> thumbnail_generation_observer_;