Changed runtime flag from 'test' to 'stable' for distributing extra logical height to rowspans.

Rowspan feature have completed and all the regressions have fixed. Now we
want this feature by default in the build and test this feature in normal
build. So we are changing runtime flag from status=test to status=stable
for some time and later we will remove the runtime flag permanently from it.

R=jchaffraix@chromium.org
BUG=78724

Review URL: https://chromiumcodereview.appspot.com/24971002

git-svn-id: svn://svn.chromium.org/blink/trunk@158484 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Don't call deviceOrPageScaleFactorChanged for each Frame.

I am not sure why, but we bug ChromeClient for each Frame, as we recursively descend
into the frame tree. I don't think that's right. FTFY.

Should not have any behavior change.

R=abarth, eseidel
BUG=

Review URL: https://chromiumcodereview.appspot.com/24998006

git-svn-id: svn://svn.chromium.org/blink/trunk@158485 bbb929c8-8fbe-4397-9dbb-9b2b20218538