[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/api/extensions_api_client.h

Index: extensions/browser/api/extensions_api_client.h
diff --git a/extensions/browser/api/extensions_api_client.h b/extensions/browser/api/extensions_api_client.h
index 4800040eadadc11360e170b95895d589cf343762..35f0114115d7da5f2210b23cae55d4f6a07938b3 100644
--- a/extensions/browser/api/extensions_api_client.h
+++ b/extensions/browser/api/extensions_api_client.h
@@ -31,8 +31,6 @@ class ContentRulesRegistry;
 class DevicePermissionsPrompt;
 class ExtensionOptionsGuest;
 class ExtensionOptionsGuestDelegate;
-class ExtensionViewGuest;
-class ExtensionViewGuestDelegate;
 class ManagementAPIDelegate;
 class MimeHandlerViewGuest;
 class MimeHandlerViewGuestDelegate;
@@ -72,6 +70,11 @@ class ExtensionsAPIClient {
           observers,
       std::map<settings_namespace::Namespace, ValueStoreCache*>* caches);
 
+  // Attaches any extra web contents helpers (like ExtensionWebContentsObserver)
+  // to |web_contents|.
+  virtual void AttachWebContentsHelpers(content::WebContents* web_contents)
+      const;
+
   // Creates the AppViewGuestDelegate.
   virtual AppViewGuestDelegate* CreateAppViewGuestDelegate() const;
 
@@ -80,11 +83,6 @@ class ExtensionsAPIClient {
   virtual ExtensionOptionsGuestDelegate* CreateExtensionOptionsGuestDelegate(
       ExtensionOptionsGuest* guest) const;
 
-  // Returns a delegate for ExtensionViewGuest. The caller owns the returned
-  // ExtensionViewGuestDelegate.
-  virtual ExtensionViewGuestDelegate* CreateExtensionViewGuestDelegate(
-      ExtensionViewGuest* guest) const;
-
   // Creates a delegate for MimeHandlerViewGuest.
   virtual scoped_ptr<MimeHandlerViewGuestDelegate>
       CreateMimeHandlerViewGuestDelegate(MimeHandlerViewGuest* guest) const;