Making extensions/chromium/*.js adhere to the style guide

@Snuffleupagus I apologize in advance because this might be hard to review. Most files (especially `chrome.tabs.executeScriptInFrame.js`) were indented in a different way than in the style guide, so fixing that caused this diff to be hard to parse.

Also it would be nice if you could compile the Chrome extension and test it to make sure nothing is broken.