FBTF: Remove unneeded headers from base/ (part 4)

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/2819094

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55345 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/pref_service.cc b/chrome/browser/pref_service.cc
index 24a3f964..826b424 100644
--- a/chrome/browser/pref_service.cc
+++ b/chrome/browser/pref_service.cc
@@ -9,6 +9,7 @@
 
 #include "app/l10n_util.h"
 #include "base/command_line.h"
+#include "base/file_path.h"
 #include "base/histogram.h"
 #include "base/logging.h"
 #include "base/message_loop.h"