Convert string16 to base::string16 in content.

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 070966eff3ba7861e5fd84ec798b97f79026ccb5..9bb2c8322a9e806193d8124b681d0de352e81b52 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -222,7 +222,7 @@ class WebContents : public PageNavigator,
   // Returns the current navigation properties, which if a navigation is
   // pending may be provisional (e.g., the navigation could result in a
   // download, in which case the URL would revert to what it was previously).
-  virtual const string16& GetTitle() const = 0;
+  virtual const base::string16& GetTitle() const = 0;
 
   // The max page ID for any page that the current SiteInstance has loaded in
   // this WebContents.  Page IDs are specific to a given SiteInstance and
@@ -250,7 +250,7 @@ class WebContents : public PageNavigator,
 
   // Return the current load state and the URL associated with it.
   virtual const net::LoadStateWithParam& GetLoadState() const = 0;
-  virtual const string16& GetLoadStateHost() const = 0;
+  virtual const base::string16& GetLoadStateHost() const = 0;
 
   // Return the upload progress.
   virtual uint64 GetUploadSize() const = 0;