Convert string16 to base::string16 in content.

content/browser/android/web_contents_observer_android.h

Index: content/browser/android/web_contents_observer_android.h
diff --git a/content/browser/android/web_contents_observer_android.h b/content/browser/android/web_contents_observer_android.h
index 9742d2827ea34bae542058500945aab992808239..15a136390f84a54a68da3123777fa0b7675b1945 100644
--- a/content/browser/android/web_contents_observer_android.h
+++ b/content/browser/android/web_contents_observer_android.h
@@ -38,17 +38,17 @@ class WebContentsObserverAndroid : public WebContentsObserver {
   virtual void DidStopLoading(RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidFailProvisionalLoad(
       int64 frame_id,
-      const string16& frame_unique_name,
+      const base::string16& frame_unique_name,
       bool is_main_frame,
       const GURL& validated_url,
       int error_code,
-      const string16& error_description,
+      const base::string16& error_description,
       RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidFailLoad(int64 frame_id,
                            const GURL& validated_url,
                            bool is_main_frame,
                            int error_code,
-                           const string16& error_description,
+                           const base::string16& error_description,
                            RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidNavigateMainFrame(const LoadCommittedDetails& details,
                                     const FrameNavigateParams& params) OVERRIDE;
@@ -64,7 +64,7 @@ class WebContentsObserverAndroid : public WebContentsObserver {
       RenderViewHost* render_view_host) OVERRIDE;
   virtual void DidCommitProvisionalLoadForFrame(
       int64 frame_id,
-      const string16& frame_unique_name,
+      const base::string16& frame_unique_name,
       bool is_main_frame,
       const GURL& url,
       PageTransition transition_type,
@@ -83,7 +83,7 @@ class WebContentsObserverAndroid : public WebContentsObserver {
   void DidFailLoadInternal(bool is_provisional_load,
                            bool is_main_frame,
                            int error_code,
-                           const string16& description,
+                           const base::string16& description,
                            const GURL& url);
 
   JavaObjectWeakGlobalRef weak_java_observer_;