Revert "Blink-side layout tests for the new Device Orientation API."

http://src.chromium.org/viewvc/blink/?revision=158028&view=revision appears to
have broken content_browsertests (DeviceOrientationBrowserTest.BasicTest).

TBR=timvolodine
BUG=

Review URL: https://codereview.chromium.org/23875046

git-svn-id: svn://svn.chromium.org/blink/trunk@158040 bbb929c8-8fbe-4397-9dbb-9b2b20218538
RenderGrid should include grid items' margins in its intrinsic size

To match flexbox and the author's intent, the grid element's intrinsic
logical widths should account for the fixed margins on any grid items'.
The change is straightforward and moves the code from RenderFlexibleBox
to RenderBlock for easy sharing.

Review URL: https://chromiumcodereview.appspot.com/24031007

git-svn-id: svn://svn.chromium.org/blink/trunk@158041 bbb929c8-8fbe-4397-9dbb-9b2b20218538