Update the location of extract_actions.py in comments.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 75af18890a3aa291e35ac6b1e2466adc75f7c774..d193dd70880ef63fa6e03f13b62afc5ea9d708f8 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -326,9 +326,9 @@ const Experiment::Choice kMapImageChoices[] = {
 // comment to the end of the feature name, like so:
 //   "my-special-feature",  // FLAGS:RECORD_UMA
 //
-// After doing that, run //chrome/tools/extract_actions.py (see instructions at
-// the top of that file for details) to update the chromeactions.txt file, which
-// will enable UMA to record your feature flag.
+// After doing that, run //tools/metrics/actions/extract_actions.py (see
+// instructions at the top of that file for details) to update the
+// chromeactions.txt file, which will enable UMA to record your feature flag.
 //
 // After your feature has shipped under a flag, you can locate the metrics under
 // the action name AboutFlags_internal-action-name. Actions are recorded once