[Extensions] Clean up the handling of ExtensionHostMsg_Request

extensions/browser/extensions_browser_client.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 26 matching lines @@
 
 class ApiActivityMonitor;
 class AppSorting;
 class ComponentExtensionResourceManager;
 class Extension;
 class ExtensionCache;
 class ExtensionHostDelegate;
 class ExtensionPrefsObserver;
 class ExtensionSystem;
 class ExtensionSystemProvider;
+class ExtensionWebContentsObserver;
 class InfoMap;
 class ProcessManagerDelegate;
 class RuntimeAPIDelegate;
 
 // Interface to allow the extensions module to make browser-process-specific
 // queries of the embedder. Should be Set() once in the browser process.
 //
 // NOTE: Methods that do not require knowledge of browser concepts should be
 // added in ExtensionsClient (extensions/common/extensions_client.h) even if
 // they are only used in the browser process.
@@ skipping 148 matching lines @@
 
   // Indicates whether extension update checks should be allowed.
   virtual bool IsBackgroundUpdateAllowed() = 0;
 
   // Indicates whether an extension update which specifies its minimum browser
   // version as |min_version| can be installed by the client. Not all extensions
   // embedders share the same versioning model, so interpretation of the string
   // is left up to the embedder.
   virtual bool IsMinBrowserVersionSupported(const std::string& min_version) = 0;
 
+  // Returns the ExtensionWebContentsObserver for the given |web_contents|.
+  virtual ExtensionWebContentsObserver* GetExtensionWebContentsObserver(
+      content::WebContents* web_contents) = 0;
+
   // Returns the single instance of |this|.
   static ExtensionsBrowserClient* Get();
 
   // Initialize the single instance.
   static void Set(ExtensionsBrowserClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_