Remove ineffective -Wunused-parameter for test code

This has no effect, as it is overridden by the use of -Wno-unused-parameter in
build/common.gypi. There are numerous cases where code built by these targets
does not comply with this warning.

R=abarth@chromium.org, abarth

Review URL: https://codereview.chromium.org/64743003

git-svn-id: svn://svn.chromium.org/blink/trunk@161582 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Deflake svg/as-object/nested-embedded-svg-size-changes.html

r161493 changed how finishJSTest behaves which made
nested-embedded-svg-size-changes.html flaky due to load timing.
This patch deflakes the test by moving jsTestIsAsync to the top of
the script block so it executes first.

BUG=316460
TBR=ojan,kbr
NOTRY=true

Review URL: https://codereview.chromium.org/65533007

git-svn-id: svn://svn.chromium.org/blink/trunk@161583 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Update TestExpectations after r161583

r161583 removed some lines it should not have from TestExpectations.
This patch adds them back.

BUG=316460
TBR=kbr
NOTRY=true

Review URL: https://codereview.chromium.org/61793005

git-svn-id: svn://svn.chromium.org/blink/trunk@161584 bbb929c8-8fbe-4397-9dbb-9b2b20218538