Try to cut down on some unnecessary dependencies.  Remove any unused includes of gurl.h in header files, and forward declare GURL where possible.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@33 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/metrics_log.h b/chrome/browser/metrics_log.h
index 69eb70c8..66796a7 100644
--- a/chrome/browser/metrics_log.h
+++ b/chrome/browser/metrics_log.h
@@ -42,11 +42,11 @@
 #include "base/histogram.h"
 #include "base/time.h"
 #include "chrome/common/page_transition_types.h"
-#include "googleurl/src/gurl.h"
 #include "webkit/glue/webplugin.h"
 
 struct AutocompleteLog;
 class DictionaryValue;
+class GURL;
 class PrefService;
 
 class MetricsLog {