Update chromeos_power watchlists.

Adds ash/system/chromeos/power/ and removes chromeos/power/.

BUG=none
TBR=jamescook@chromium.org

Review URL: https://codereview.chromium.org/18477009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@209974 0039d316-1c4b-4281-b951-d872f2087c98

WATCHLISTS

@@ -151,8 +151,8 @@
                   'chrome/browser/chromeos/net/',
     },
     'chromeos_power': {
-      'filepath': 'chromeos/dbus/power_.*|'\
-                  'chromeos/power/|'\
+      'filepath': 'ash/system/chromeos/power/|'\
+                  'chromeos/dbus/power_.*|'\
                   'chrome/browser/chromeos/power/',
     },
     'chromeos_webui': {