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

content/child/fileapi/webfilesystem_impl.cc

Index: content/child/fileapi/webfilesystem_impl.cc
diff --git a/content/child/fileapi/webfilesystem_impl.cc b/content/child/fileapi/webfilesystem_impl.cc
index 640c1a905143c1e8a77f948c761c78b1fa6c1287..59e9d5645f63110e02b7d6cb415f3af639541aa7 100644
--- a/content/child/fileapi/webfilesystem_impl.cc
+++ b/content/child/fileapi/webfilesystem_impl.cc
@@ -151,7 +151,7 @@ void OpenFileSystemCallbackAdapter(
   CallbackFileSystemCallbacks(
       thread_id, callbacks_id, waitable_results,
       &WebFileSystemCallbacks::didOpenFileSystem,
-      MakeTuple(UTF8ToUTF16(name), root));
+      MakeTuple(base::UTF8ToUTF16(name), root));
 }
 
 void ResolveURLCallbackAdapter(
@@ -164,7 +164,7 @@ void ResolveURLCallbackAdapter(
   CallbackFileSystemCallbacks(
       thread_id, callbacks_id, waitable_results,
       &WebFileSystemCallbacks::didResolveURL,
-      MakeTuple(UTF8ToUTF16(info.name), info.root_url,
+      MakeTuple(base::UTF8ToUTF16(info.name), info.root_url,
                 static_cast<blink::WebFileSystemType>(info.mount_type),
                 normalized_path.AsUTF16Unsafe(), is_directory));
 }