[chromium] Fix contents size calculation for page scale initialization
https://bugs.webkit.org/show_bug.cgi?id=108204

Reviewed by enne.

My previous patch http://webk.it/107424 had a few issues that are
blocking WebKit roll.

- We still need the layout in resize() given that
http://webk.it/107922 was reverted.

- I deleted code used only for the old page-scale mode in
contentsSize(), but this needs to wait until WebKit roll since it's
making bots fail in this short term.

* src/WebViewImpl.cpp:
(WebKit::WebViewImpl::resize):
(WebKit::WebViewImpl::contentsSize):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141134 268f45cc-cd09-0410-ab3c-d52691b4dbfc