[NaCl SDK Docs] Update CSS for docs.

* Add a top-level <div> with id "doxygen-ref", to more easily match only
doxygen-generated elements. This is the same behavior as with devsite.
* Also add doxygen.css, which is minimal so far; it mostly just cleans up the
table layout.
* Also removing the local_extensions.css file. It was only used for local testing make the generated pages look more like devsite.

BUG=none
R=awatson@chromium.org, sbc@chromium.org

Review URL: https://codereview.chromium.org/153333002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249462 0039d316-1c4b-4281-b951-d872f2087c98
Disable prerender on mobile for 1% users.

Prerender is enabled for 100% users by default today, but this change
turns off it for 1% users for comparison.

BUG=341056

Review URL: https://codereview.chromium.org/143203003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249463 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249462
Add check to HidingWindowAnimationObserver to determine if a child window of the window animating hidden outliving the window being animated is the source of http://crbug.com/338788

BUG=338788
TEST=None

Review URL: https://codereview.chromium.org/150573007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249464 0039d316-1c4b-4281-b951-d872f2087c98
apps/shell: Fix TODO typo.

PrefRegistrySimple is in base/prefs/pref_registry_simple.h not in
components/user_prefs/ as the comment implies.

BUG=None
TEST=None
R=jamescook@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/156333003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249465 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249465