Revert 169264 "Add plumbing for font-stretch"

Cause the below tests to crash on Linux Debug:

fast/dom/shadow/pseudoclass-update-checked-option.html,fast/dom/shadow/pseudoclass-update-disabled-option.html,fast/dom/shadow/pseudoclass-update-enabled-option.html

http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20Oilpan%20%28dbg%29/builds/1058

> Add plumbing for font-stretch
> 
> Implement support for parsing and querying the font-stretch CSS
> property, for extracting the font-stretch from the short-hand font
> property, and for querying the font-stretch through getComputedStyle.
> 
> Note that this patch does _not_ implement the font-stretch
> functionality itself, it merely adds the required plumbing.
> 
> Request to implement thread:
>   https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/N24I2zJemvI
> 
> Entry in Chromium Dashboard:
>   http://www.chromestatus.com/features/4598830058176512
> 
> R=dglazkov@chromium.org
> BUG=331119
> TEST=fast/css3-text/font-stretch.html
> 
> Review URL: https://codereview.chromium.org/199423003

TBR=eae@chromium.org

Review URL: https://codereview.chromium.org/195823006

git-svn-id: svn://svn.chromium.org/blink/trunk@169273 bbb929c8-8fbe-4397-9dbb-9b2b20218538