[Extensions] Determine NativeMessaging ID solely on the browser process

extensions/browser/extension_web_contents_observer.h

 // Copyright 2014 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_EXTENSION_WEB_CONTENTS_OBSERVER_H_
 #define EXTENSIONS_BROWSER_EXTENSION_WEB_CONTENTS_OBSERVER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 38 matching lines @@
 class ExtensionWebContentsObserver
     : public content::WebContentsObserver,
       public ExtensionFunctionDispatcher::Delegate {
  public:
   // Returns the ExtensionWebContentsObserver for the given |web_contents|.
   static ExtensionWebContentsObserver* GetForWebContents(
       content::WebContents* web_contents);
 
   ExtensionFunctionDispatcher* dispatcher() { return &dispatcher_; }
 
+  // Returns the extension associated with the given |render_frame_host|, or
+  // null if there is none.
+  // If |verify_url| is false, only the SiteInstance is taken into account.
+  // If |verify_url| is true, the frame's last committed URL is also used to
+  // improve the classification of the frame.
+  const Extension* GetExtensionFromFrame(
+      content::RenderFrameHost* render_frame_host,
+      bool verify_url) const;
+
  protected:
   explicit ExtensionWebContentsObserver(content::WebContents* web_contents);
   ~ExtensionWebContentsObserver() override;
 
   content::BrowserContext* browser_context() { return browser_context_; }
 
   // Initializes a new render frame. Subclasses should invoke this
   // implementation if extending.
   virtual void InitializeRenderFrame(
       content::RenderFrameHost* render_frame_host);
@@ skipping 23 matching lines @@
   // Per the documentation in WebContentsObserver, these two methods are invoked
   // when a Pepper plugin instance is attached/detached in the page DOM.
   void PepperInstanceCreated() override;
   void PepperInstanceDeleted() override;
 
   // Returns the extension id associated with the given |render_frame_host|, or
   // the empty string if there is none.
   std::string GetExtensionIdFromFrame(
       content::RenderFrameHost* render_frame_host) const;
 
-  // Returns the extension associated with the given |render_frame_host|, or
-  // null if there is none.
-  // If |verify_url| is false, only the SiteInstance is taken into account.
-  // If |verify_url| is true, the frame's last committed URL is also used to
-  // improve the classification of the frame.
-  const Extension* GetExtensionFromFrame(
-      content::RenderFrameHost* render_frame_host,
-      bool verify_url) const;
-
   // TODO(devlin): Remove these once callers are updated to use the FromFrame
   // equivalents.
   // Returns the extension or app associated with a render view host. Returns
   // NULL if the render view host is not for a valid extension.
   const Extension* GetExtension(content::RenderViewHost* render_view_host);
   // Returns the extension or app ID associated with a render view host. Returns
   // the empty string if the render view host is not for a valid extension.
   static std::string GetExtensionId(content::RenderViewHost* render_view_host);
 
  private:
   void OnRequest(content::RenderFrameHost* render_frame_host,
                  const ExtensionHostMsg_Request_Params& params);
 
   // A helper function for initializing render frames at the creation of the
   // observer.
   void InitializeFrameHelper(content::RenderFrameHost* render_frame_host);
 
   // The BrowserContext associated with the WebContents being observed.
   content::BrowserContext* browser_context_;
 
   ExtensionFunctionDispatcher dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionWebContentsObserver);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_WEB_CONTENTS_OBSERVER_H_