Remove the layout timer

As discussed on blink-dev, we want to remove the layout timer
in order to better synchronize work with the compositor.
Prior to this CL, we'd trigger layout at arbitrary times,
which meant we could end up doing layout multiple times per
frame unnecessarily.

BUG=340357

Review URL: https://codereview.chromium.org/145663012

git-svn-id: svn://svn.chromium.org/blink/trunk@166415 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Avoid double lookup of crossorigin attribute.

Minor code tidying.

R=
BUG=

Review URL: https://codereview.chromium.org/153823002

git-svn-id: svn://svn.chromium.org/blink/trunk@166416 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Making myself OWNER in Source/platform

R=kbr@chromium.org

Review URL: https://codereview.chromium.org/137463011

git-svn-id: svn://svn.chromium.org/blink/trunk@166418 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unnecessary by-reference argument from ApplyStyleCommand

The only caller of ApplyStyleCommand::replaceWithSpanOrRemoveIfWithoutAttributes
immediately returns, so having that method modify its argument is useless.

Also simplified the method's code, since its assertions are redundant with those
in the code it calls.

R=leviw@chromium.org

Review URL: https://codereview.chromium.org/144483013

git-svn-id: svn://svn.chromium.org/blink/trunk@166419 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Drop nullptr support from oilpan

We noticed that using nullptr in oilpan causes build issues
since the current Blink uses 0 instead of nullptr.
In order not to mix nullptr and 0, this CL drops nullptr from
oilpan.

Review URL: https://codereview.chromium.org/140413008

git-svn-id: svn://svn.chromium.org/blink/trunk@166420 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Deprecate the HTMLSourceElement.media IDL attribute

Intent to Deprecate:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/L5h6KP5nmbE/CGlSWugrFl0J

BUG=338197

Review URL: https://codereview.chromium.org/153613002

git-svn-id: svn://svn.chromium.org/blink/trunk@166421 bbb929c8-8fbe-4397-9dbb-9b2b20218538