Separate chrome/common/metrics/metrics_helpers.{h,cc} into files for the constituent classes.

BUG=none
TEST=none (code cleanup)
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Review URL: http://codereview.chromium.org/9159004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@119345 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/metrics/metrics_log.h b/chrome/browser/metrics/metrics_log.h
index 6a75b67..a5a3504 100644
--- a/chrome/browser/metrics/metrics_log.h
+++ b/chrome/browser/metrics/metrics_log.h
@@ -13,7 +13,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
-#include "chrome/common/metrics/metrics_helpers.h"
+#include "chrome/common/metrics/metrics_log_base.h"
 
 struct AutocompleteLog;
 class PrefService;