Cleanup GraphicsLayer by removing unused code

This patch removes the following unused functions from GraphicsLayer:
1) void addChildAtIndex(GraphicsLayer*, int index)
2) void addChildAbove(GraphicsLayer*, GraphicsLayer* sibling)
3) bool replaceChild(GraphicsLayer* oldChild, GraphicsLayer* newChild)

No new tests as there is no change in behavior.

Review URL: https://codereview.chromium.org/437353005

git-svn-id: svn://svn.chromium.org/blink/trunk@179531 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: [Profiler] Extract ProfileTypeRegistry from ProfilesPanel.js

This is required for the new script loader that does not allow importScript()

BUG=391566
R=yurys

Review URL: https://codereview.chromium.org/442663004

git-svn-id: svn://svn.chromium.org/blink/trunk@179532 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix Failure=>ImageOnlyFailure for media/video tests.

TBR=scherkus
BUG=365857

Review URL: https://codereview.chromium.org/442113002

git-svn-id: svn://svn.chromium.org/blink/trunk@179533 bbb929c8-8fbe-4397-9dbb-9b2b20218538
De-flake http/tests/navigation/same-and-different-back.html

The goal of this test is to have two separate iframes navigating
during a back navigation, one same-document navigation and one
different-document navigation. This patch stabilizes the ordering
of actions to guarantee that the creation of a new history entry
happens at the right time.

BUG=355274

Review URL: https://codereview.chromium.org/441723002

git-svn-id: svn://svn.chromium.org/blink/trunk@179534 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r179475

http://src.chromium.org/viewvc/blink?view=revision&revision=179475

BUG=398635
TBR=fmalita@chromium.org

Review URL: https://codereview.chromium.org/443713003

git-svn-id: svn://svn.chromium.org/blink/trunk@179535 bbb929c8-8fbe-4397-9dbb-9b2b20218538