Moving extension code out of "components/" to avoid layering violations.

chrome/browser/renderer_context_menu/context_menu_content_type_platform_app.cc

 // 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.
 
 #include "chrome/browser/renderer_context_menu/context_menu_content_type_platform_app.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
+#include "content/public/browser/web_contents.h"
+#include "extensions/browser/process_manager.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest.h"
 
+using extensions::Extension;
+using extensions::ProcessManager;
+
 ContextMenuContentTypePlatformApp::ContextMenuContentTypePlatformApp(
     content::WebContents* web_contents,
     const content::ContextMenuParams& params)
     : ContextMenuContentType(web_contents, params, false) {
 }
 
 ContextMenuContentTypePlatformApp::~ContextMenuContentTypePlatformApp() {
 }
 
+const Extension* ContextMenuContentTypePlatformApp::GetExtension() const {
+  ProcessManager* process_manager =
+      ProcessManager::Get(source_web_contents()->GetBrowserContext());
+  return process_manager->GetExtensionForWebContents(
+      source_web_contents());
+}
+
 bool ContextMenuContentTypePlatformApp::SupportsGroup(int group) {
   const extensions::Extension* platform_app = GetExtension();
 
   // The RVH might be for a process sandboxed from the extension.
   if (!platform_app)
     return false;
 
   DCHECK(platform_app->is_platform_app());
 
   switch (group) {
     // Add undo/redo, cut/copy/paste etc for text fields.
     case ITEM_GROUP_EDITABLE:
     case ITEM_GROUP_COPY:
       return ContextMenuContentType::SupportsGroup(group);
     case ITEM_GROUP_CURRENT_EXTENSION:
       return true;
     case ITEM_GROUP_DEVTOOLS_UNPACKED_EXT:
       // Add dev tools for unpacked extensions.
       return extensions::Manifest::IsUnpackedLocation(
                  platform_app->location()) ||
              base::CommandLine::ForCurrentProcess()->HasSwitch(
                  switches::kDebugPackedApps);
     default:
       return false;
   }
 }