Revert "Avoid calling notifyResizeForViewportUnits when viewport wasn't resized."

This reverts commit 32d8fae2fa4e03580102eea94112c7abe342ee1f.

Potential cause for breaking webkit_unit_tests TouchActionTest.Simple on
Android Tests (dbg) and WebKit Android (Nexus4)

BUG=410268
TBR=tkent,stevet,yoav@yoav.ws,bokan

Review URL: https://codereview.chromium.org/538053002

git-svn-id: svn://svn.chromium.org/blink/trunk@181382 bbb929c8-8fbe-4397-9dbb-9b2b20218538