Move file_path.h to base/files.

TBR=sky

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@184344 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index fb7f3c8..ebe669c3 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -13,7 +13,7 @@
 #include <utility>
 #include <vector>
 
-#include "base/file_path.h"
+#include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/hash_tables.h"
 #include "base/memory/linked_ptr.h"