Convert string16 to base::string16 in content.

content/browser/media/media_internals_proxy.h

Index: content/browser/media/media_internals_proxy.h
diff --git a/content/browser/media/media_internals_proxy.h b/content/browser/media/media_internals_proxy.h
index 5d173b3e738d90417038d8c15cee1606e6103ff8..b737b858a3efb4c4550609873af6805c4d4897de 100644
--- a/content/browser/media/media_internals_proxy.h
+++ b/content/browser/media/media_internals_proxy.h
@@ -49,7 +49,7 @@ class MediaInternalsProxy
   void GetEverything();
 
   // MediaInternals callback. Called on the IO thread.
-  void OnUpdate(const string16& update);
+  void OnUpdate(const base::string16& update);
 
   // net::NetLog::ThreadSafeObserver implementation. Callable from any thread:
   virtual void OnAddEntry(const net::NetLog::Entry& entry) OVERRIDE;
@@ -65,7 +65,7 @@ class MediaInternalsProxy
   void ObserveMediaInternalsOnIOThread();
   void StopObservingMediaInternalsOnIOThread();
   void GetEverythingOnIOThread();
-  void UpdateUIOnUIThread(const string16& update);
+  void UpdateUIOnUIThread(const base::string16& update);
 
   // Put |entry| on a list of events to be sent to the page.
   void AddNetEventOnUIThread(base::Value* entry);