Bindings: rename |resultValue| => |jsValue|

Fixes irregular naming in [ReflectOnly], simplifies code.
Fixes 2 FIXMEs.

BUG=345503
TBR=haraken

Review URL: https://codereview.chromium.org/212593008

git-svn-id: svn://svn.chromium.org/blink/trunk@170128 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Mark some tests flaky.

BUG=347001,347002,347003,347004
TBR=enne@chromium.org

Review URL: https://codereview.chromium.org/212663009

git-svn-id: svn://svn.chromium.org/blink/trunk@170129 bbb929c8-8fbe-4397-9dbb-9b2b20218538