Fix a gcc 4.3 warning in page_action.h.
Fix a gcc 4.3 warning in page_action.h.

Patch from Livio Soares <liviobs@gmail.com>.
Review URL: http://codereview.chromium.org/99309

git-svn-id: http://src.chromium.org/svn/trunk/src@15126 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7b9faeb63ad492863a2dc612c78f14bd0d7dc71e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser