FBTF: Header cleanup in chrome/common. Part 1.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3106016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56444 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/common/important_file_writer.h b/chrome/common/important_file_writer.h
index a25ad5f..5fdabce4 100644
--- a/chrome/common/important_file_writer.h
+++ b/chrome/common/important_file_writer.h
@@ -62,7 +62,7 @@
   // of destruction.
   ~ImportantFileWriter();
 
-  FilePath path() const { return path_; }
+  const FilePath& path() const { return path_; }
 
   // Returns true if there is a scheduled write pending which has not yet
   // been started.