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Currently, location.reload() always triggers a get. Change it to go through
the FrameLoaer::reload() path, like a user-initiated reload.

This aligns our behavior with firefox and IE.

BUG=6429
TEST=http/tests/navigation/location-reload-after-post.php

Review URL: https://codereview.chromium.org/410223003

git-svn-id: svn://svn.chromium.org/blink/trunk@179176 bbb929c8-8fbe-4397-9dbb-9b2b20218538