[DevTools] Move from load notifications to LoadCompleted callback.

This is essential for properly handling second WebContents for overlay.
It also aligns with a goal of removing notifications (crbug.com/170921).

BUG=none

Review URL: https://codereview.chromium.org/159943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250712 0039d316-1c4b-4281-b951-d872f2087c98
Moving display constants from OutputConfigurator to ui/display

Before defining DisplayMode, DisplaySnapshot, NativeDisplayDelegate,
etc. in ui/display and updating OutputConfigurator to use these 
components, moving all the enums required by these components.

BUG=333413

Review URL: https://codereview.chromium.org/154613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250713 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250712
roll skia DEPS to 13419

Chromium base revision: 250702 / 211eb799
Old Skia revision: 13390
New Skia revision: 13419
Control CL: https://codereview.chromium.org/155843008

This CL was created by Skia's roll_deps.py script.

Bypassing commit queue trybots:
NOTRY=true

Review URL: https://codereview.chromium.org/149603008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250714 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250715 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250715