[sessions] Properly namespace recently-componentized TabRestore code

chrome/browser/android/recently_closed_tabs_bridge.h

 // Copyright 2013 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_RECENTLY_CLOSED_TABS_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_RECENTLY_CLOSED_TABS_BRIDGE_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/compiler_specific.h"
 #include "components/sessions/core/tab_restore_service_observer.h"
 
 class Profile;
-class TabRestoreService;
 
 // Provides the list of recently closed tabs to Java.
-class RecentlyClosedTabsBridge : public TabRestoreServiceObserver {
+class RecentlyClosedTabsBridge : public sessions::TabRestoreServiceObserver {
  public:
   explicit RecentlyClosedTabsBridge(Profile* profile);
 
   void Destroy(JNIEnv* env, jobject obj);
   void SetRecentlyClosedCallback(JNIEnv* env, jobject obj, jobject jcallback);
   jboolean GetRecentlyClosedTabs(JNIEnv* env,
                                  jobject obj,
                                  jobject jtabs,
                                  jint max_tab_count);
   jboolean OpenRecentlyClosedTab(JNIEnv* env,
                                  jobject obj,
                                  jobject jtab,
                                  jint tab_id,
                                  jint j_disposition);
   void ClearRecentlyClosedTabs(JNIEnv* env, jobject obj);
 
   // Observer callback for TabRestoreServiceObserver. Notifies the registered
   // callback that the recently closed tabs list has changed.
-  void TabRestoreServiceChanged(TabRestoreService* service) override;
+  void TabRestoreServiceChanged(sessions::TabRestoreService* service) override;
 
   // Observer callback when our associated TabRestoreService is destroyed.
-  void TabRestoreServiceDestroyed(TabRestoreService* service) override;
+  void TabRestoreServiceDestroyed(
+      sessions::TabRestoreService* service) override;
 
   // Registers JNI methods.
   static bool Register(JNIEnv* env);
 
  private:
   ~RecentlyClosedTabsBridge() override;
 
   // Construct and initialize tab_restore_service_ if it's NULL.
   // tab_restore_service_ may still be NULL, however, in incognito mode.
   void EnsureTabRestoreService();
 
   // The callback to be notified when the list of recently closed tabs changes.
   base::android::ScopedJavaGlobalRef<jobject> callback_;
 
   // The profile whose recently closed tabs are being monitored.
   Profile* profile_;
 
   // TabRestoreService that we are observing.
-  TabRestoreService* tab_restore_service_;
+  sessions::TabRestoreService* tab_restore_service_;
 
   DISALLOW_COPY_AND_ASSIGN(RecentlyClosedTabsBridge);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_RECENTLY_CLOSED_TABS_BRIDGE_H_