Revert 158684 "Fix creating InjectedScript too early causing ext..."

> Fix creating InjectedScript too early causing extension bindings not to work.
> 
> BUG=263162
> TEST=manual
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=155947
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=156062
> 
> Review URL: https://codereview.chromium.org/22884002

TBR=tengs@chromium.org

Review URL: https://codereview.chromium.org/26063002

git-svn-id: svn://svn.chromium.org/blink/trunk@158963 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add mac framework dependencies to TestRunner

Right now, TestRunner is inheriting this link_setting from 'base', but
this is taking advantage of a GYP bug where link_settings were
propagated outside shared_library targets.

The GYP bug is fixed in r1717, but in order to enable it, Blink's
link_settings need to be fixed first.

R=abarth@chromium.org
BUG=

Review URL: https://codereview.chromium.org/26024003

git-svn-id: svn://svn.chromium.org/blink/trunk@158964 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Crash in RenderLayer::repaintBlockSelection

This is a blind fix as I couldn't get a reproduction from our
crashes. From the traces, it looks like a NULL scrollable area
when accessing scrolledContentOffset but for good measure, I
added the NULL check everywhere.

BUG=302128

Review URL: https://codereview.chromium.org/25729003

git-svn-id: svn://svn.chromium.org/blink/trunk@158965 bbb929c8-8fbe-4397-9dbb-9b2b20218538