Fix FrameView movement issue

Fix bug caused by r167109 that FrameView movements were ignored.

BUG=344482
TEST=WebFrameTest.FrameViewSetFrameRect
R=leviw@chromium.org
TBR=(Source/web/tests)

Review URL: https://codereview.chromium.org/171413003

git-svn-id: svn://svn.chromium.org/blink/trunk@167424 bbb929c8-8fbe-4397-9dbb-9b2b20218538