Undoing revert, cl is not the cause of gcm crash on canary.

chrome/browser/extensions/api/copresence/copresence_api.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 CHROME_BROWSER_EXTENSIONS_API_COPRESENCE_COPRESENCE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_COPRESENCE_COPRESENCE_API_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/copresence/copresence_translations.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "chrome/common/extensions/api/copresence.h"
 #include "components/copresence/public/copresence_delegate.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 
 class ChromeWhispernetClient;
 
 namespace copresence {
 class CopresenceManager;
 class WhispernetClient;
 }
 
+namespace gcm {
+class GCMDriver;
+}
+
 namespace extensions {
 
 class CopresenceService : public BrowserContextKeyedAPI,
                           public copresence::CopresenceDelegate {
  public:
   explicit CopresenceService(content::BrowserContext* context);
   ~CopresenceService() override;
 
   // BrowserContextKeyedAPI implementation.
   void Shutdown() override;
@@ skipping 29 matching lines @@
 
   // CopresenceDelegate implementation
   void HandleMessages(const std::string& app_id,
                       const std::string& subscription_id,
                       const std::vector<copresence::Message>& message) override;
   void HandleStatusUpdate(copresence::CopresenceStatus status) override;
   net::URLRequestContextGetter* GetRequestContext() const override;
   const std::string GetPlatformVersionString() const override;
   const std::string GetAPIKey(const std::string& app_id) const override;
   copresence::WhispernetClient* GetWhispernetClient() override;
+  gcm::GCMDriver* GetGCMDriver() override;
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() { return "CopresenceService"; }
 
   bool is_shutting_down_;
   std::map<std::string, std::string> apps_by_subscription_id_;
 
   content::BrowserContext* const browser_context_;
   std::map<std::string, std::string> api_keys_by_app_;
 
@@ skipping 38 matching lines @@
                              COPRESENCE_SETAUTHTOKEN);
 
  protected:
   virtual ~CopresenceSetAuthTokenFunction() {}
   ExtensionFunction::ResponseAction Run() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_COPRESENCE_COPRESENCE_API_H_