make chrome.tabs.executeScript/insertCss details arg required.
make chrome.tabs.executeScript/insertCss details arg required.

they were marked as optional and if either functions were called no arguments, the extension process was terminated because it thought was expecting an argument list.

BUG=33628

Review URL: http://codereview.chromium.org/558049

git-svn-id: http://src.chromium.org/svn/trunk/src@37713 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 85211b4c3f1a3cb171762ab904cd8ec4d415c93a
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