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: de016e52bd170d2d4f2344f9bf92d50478b649e0@37713 0039d316-1c4b-4281-b951-d872f2087c98

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