Convert string16 to base::string16 in content.

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index f9e495130362be2519fe1a6ad0960428aae0d3db..63ad65baeabd93980bd423d3078685cb4074f52b 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -41,9 +41,9 @@ bool WebContentsDelegate::ShouldSuppressDialogs() {
 
 bool WebContentsDelegate::AddMessageToConsole(WebContents* source,
                                               int32 level,
-                                              const string16& message,
+                                              const base::string16& message,
                                               int32 line_no,
-                                              const string16& source_id) {
+                                              const base::string16& source_id) {
   return false;
 }
 
@@ -125,7 +125,7 @@ bool WebContentsDelegate::ShouldCreateWebContents(
     WebContents* web_contents,
     int route_id,
     WindowContainerType window_container_type,
-    const string16& frame_name,
+    const base::string16& frame_name,
     const GURL& target_url,
     const std::string& partition_id,
     SessionStorageNamespace* session_storage_namespace) {