Update uses of UTF conversions in content/ to use the base:: namespace.

content/shell/browser/shell_javascript_dialog_manager.cc

Index: content/shell/browser/shell_javascript_dialog_manager.cc
diff --git a/content/shell/browser/shell_javascript_dialog_manager.cc b/content/shell/browser/shell_javascript_dialog_manager.cc
index 6ac7243bfb5b8ba71aa2b1b18b4df1063f05c1f0..7f3b678ea7f47784e6e1c16dab09cd4e828e2016 100644
--- a/content/shell/browser/shell_javascript_dialog_manager.cc
+++ b/content/shell/browser/shell_javascript_dialog_manager.cc
@@ -53,7 +53,7 @@ void ShellJavaScriptDialogManager::RunJavaScriptDialog(
   }
 
   base::string16 new_message_text = net::FormatUrl(origin_url, accept_lang) +
-                              ASCIIToUTF16("\n\n") +
+                              base::ASCIIToUTF16("\n\n") +
                               message_text;
   gfx::NativeWindow parent_window =
       web_contents->GetView()->GetTopLevelNativeWindow();
@@ -97,7 +97,7 @@ void ShellJavaScriptDialogManager::RunBeforeUnloadDialog(
 
   base::string16 new_message_text =
       message_text +
-      ASCIIToUTF16("\n\nIs it OK to leave/reload this page?");
+      base::ASCIIToUTF16("\n\nIs it OK to leave/reload this page?");
 
   gfx::NativeWindow parent_window =
       web_contents->GetView()->GetTopLevelNativeWindow();