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

chrome/browser/extensions/api/copresence/copresence_api.h

Index: chrome/browser/extensions/api/copresence/copresence_api.h
diff --git a/chrome/browser/extensions/api/copresence/copresence_api.h b/chrome/browser/extensions/api/copresence/copresence_api.h
index b7103cf48a0514f6887742b7dd61a852b34c0318..d49c878faaaa3a46735dc513591e8b3714bc94bd 100644
--- a/chrome/browser/extensions/api/copresence/copresence_api.h
+++ b/chrome/browser/extensions/api/copresence/copresence_api.h
@@ -24,6 +24,10 @@ class CopresenceManager;
 class WhispernetClient;
 }
 
+namespace gcm {
+class GCMDriver;
+}
+
 namespace extensions {
 
 class CopresenceService : public BrowserContextKeyedAPI,
@@ -73,6 +77,7 @@ class CopresenceService : public BrowserContextKeyedAPI,
   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"; }