Add explicit base to FilePath.

content/app/content_main_runner.cc

Index: content/app/content_main_runner.cc
diff --git a/content/app/content_main_runner.cc b/content/app/content_main_runner.cc
index eb0eba38a36d723f733884409765c1fa35545a97..047a8bb90468ab98fb502e5b599143a3019be74d 100644
--- a/content/app/content_main_runner.cc
+++ b/content/app/content_main_runner.cc
@@ -364,7 +364,7 @@ int RunZygote(const MainFunctionParams& main_function_params,
     // Each Renderer we spawn will re-attempt initialization of the media
     // libraries, at which point failure will be detected and handled, so
     // we do not need to cope with initialization failures here.
-    FilePath media_path;
+    base::FilePath media_path;
     if (PathService::Get(DIR_MEDIA_LIBS, &media_path))
       media::InitializeMediaLibrary(media_path);
   }