Add explicit base to FilePath.

content/shell/shell_message_filter.h

Index: content/shell/shell_message_filter.h
diff --git a/content/shell/shell_message_filter.h b/content/shell/shell_message_filter.h
index 50eb29e5a6238e00404c0b0fee7edc7bdb76fabb..52eaf20deb8fc47cae3cb72109baa6561fbf78fe 100644
--- a/content/shell/shell_message_filter.h
+++ b/content/shell/shell_message_filter.h
@@ -25,9 +25,10 @@ class ShellMessageFilter : public BrowserMessageFilter {
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
-  void OnReadFileToString(const FilePath& local_file, std::string* contents);
+  void OnReadFileToString(const base::FilePath& local_file,
+                          std::string* contents);
   void OnRegisterIsolatedFileSystem(
-      const std::vector<FilePath>& absolute_filenames,
+      const std::vector<base::FilePath>& absolute_filenames,
       std::string* filesystem_id);
 
   int render_process_id_;