Rename WidthIterator to SimpleShaper

Rename the WidthIterator class to SimpleShaper to better describe what
the class does and what it should be used for. Also rename instances of
it from it or iterator to shaper.

This does not change the public interface of the class, it merely
changes the name.

R=fmalita@chromium.org

Review URL: https://codereview.chromium.org/612583002

git-svn-id: svn://svn.chromium.org/blink/trunk@182815 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Re-land r182769 with dependency fixes

- A few scripts were missed during rename
- Worker modules were generated by two targets at once (one of them used a bogus output location).

R=pfeldman@chromium.org, dgozman

Review URL: https://codereview.chromium.org/606073002

git-svn-id: svn://svn.chromium.org/blink/trunk@182816 bbb929c8-8fbe-4397-9dbb-9b2b20218538