Add FilePath to base namespace.

content/public/browser/pepper_flash_settings_helper.h

Index: content/public/browser/pepper_flash_settings_helper.h
diff --git a/content/public/browser/pepper_flash_settings_helper.h b/content/public/browser/pepper_flash_settings_helper.h
index 7fb4cc41fd79c7cf4222d895d74afa0598eb4ce6..72f069d8ab450ee9025def7beadaf03101016952 100644
--- a/content/public/browser/pepper_flash_settings_helper.h
+++ b/content/public/browser/pepper_flash_settings_helper.h
@@ -9,7 +9,9 @@
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 
+namespace base {
 class FilePath;
+}
 
 namespace IPC {
 struct ChannelHandle;
@@ -29,7 +31,7 @@ class CONTENT_EXPORT PepperFlashSettingsHelper
   typedef base::Callback<void(bool /* success */,
                               const IPC::ChannelHandle& /* channel_handle */)>
       OpenChannelCallback;
-  virtual void OpenChannelToBroker(const FilePath& path,
+  virtual void OpenChannelToBroker(const base::FilePath& path,
                                    const OpenChannelCallback& callback) = 0;
 
  protected: