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 causes the diff here to be hard to parse. It might be easier to just use the `View` button for some files and go through the files to see if all is correct.

It would be nice if you could compile the Chrome extension and test it to make sure nothing is broken.