Drop the 'USE(RTL_SCROLLBAR)' compile-time flag.

Chromium never disables this; removing the branch should have no web-visible
effect, and slightly simplifies the code.

Review URL: https://codereview.chromium.org/14060005

git-svn-id: svn://svn.chromium.org/blink/trunk@148449 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Dev Tools>Network tab> Observed a gap in the Name field.

Do not hide corner in the brief mode.

BUG=231267

Review URL: https://codereview.chromium.org/14264007

git-svn-id: svn://svn.chromium.org/blink/trunk@148450 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove unused flags from FeatureDefines.h

None of these flags are being referenced outside this file anymore.

BUG=

Review URL: https://codereview.chromium.org/14261004

git-svn-id: svn://svn.chromium.org/blink/trunk@148451 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename ThreadableWebSocketChannel to WebSocketChannel.

ThreadableWebSocketChannel is not "threadable" in the ordinary sense.
This is a refactoring without behavior change.

BUG=230294

Review URL: https://codereview.chromium.org/14211002

Patch from Yutaka Hirano <yhirano@chromium.org>.

git-svn-id: svn://svn.chromium.org/blink/trunk@148452 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove the ENABLE_DIRECTORY_UPLOAD compile time flag, introduce a run-time flag.

This feature is being compiled in for all of Chromium, but is not
supported on Android. In this patch also I introduce a run-time flag,
allowing Android to disable it in a separate Chromium patch.

BUG=

Review URL: https://codereview.chromium.org/14234003

git-svn-id: svn://svn.chromium.org/blink/trunk@148453 bbb929c8-8fbe-4397-9dbb-9b2b20218538