[FastTextAutosizer] Cleanup cruft left over from the old text autosizer

This patch updates the text autosizing tests to all use autosizingTest.js
instead of duplicating the autosizing logic. This will make it easier
to remove HACK_FORCE_TEXT_AUTOSIZING_ON_DESKTOP, for example.

This patch also removes some incorrect comments from FastTextAutosizer.cpp

Review URL: https://codereview.chromium.org/292513004

git-svn-id: svn://svn.chromium.org/blink/trunk@174253 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Move HelpScreenUntilReload.js from "components" into "main"

The "main" module contents are also being moved into their own directory

R=pfeldman, vsevik
NOTRY=true

Review URL: https://codereview.chromium.org/289043004

git-svn-id: svn://svn.chromium.org/blink/trunk@174254 bbb929c8-8fbe-4397-9dbb-9b2b20218538