Fix race with google variation ID registration

chrome/browser/android/data_usage/external_data_use_observer_bridge.h

 // Copyright 2015 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_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_BRIDGE_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 80 matching lines @@
   // installed or uninstalled. |is_control_app_installed| is true if app is
   // installed.
   void OnControlAppInstallStateChange(JNIEnv* env,
                                       jobject obj,
                                       bool is_control_app_installed) const;
 
   // Called by DataUseMatcher to notify |external_data_use_observer_| if it
   // should register as a data use observer.
   virtual void ShouldRegisterAsDataUseObserver(bool should_register) const;
 
-  void SetRegisterGoogleVariationID(bool register_google_variation_id);
+  void RegisterGoogleVariationID(bool should_register);
 
  private:
   // Java listener that provides regular expressions to |this|. Data use
   // reports are submitted to |j_external_data_use_observer_|.
   base::android::ScopedJavaGlobalRef<jobject> j_external_data_use_observer_;
 
   // |external_data_use_observer_| owns |this|. |external_data_use_observer_| is
   // notified of results from Java code by |this|.
   base::WeakPtr<ExternalDataUseObserver> external_data_use_observer_;
 
   // |data_use_tab_model_| is notified of the matching rules on UI thread.
   // |data_use_tab_model_| may be null.
   base::WeakPtr<DataUseTabModel> data_use_tab_model_;
 
   // The construction time of |this|.
   const base::TimeTicks construct_time_;
 
   // True if matching rules are fetched for the first time.
   bool is_first_matching_rule_fetch_;
 
-  // True if Google variation ID should be registered.
-  bool register_google_variation_id_;
-
   // |io_task_runner_| accesses ExternalDataUseObserver members on IO thread.
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalDataUseObserverBridge);
 };
 
 bool RegisterExternalDataUseObserver(JNIEnv* env);
 
 }  // namespace android
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_BRIDGE_H_