Don't set page scale limits inside EventSender::setPageScaleFactor.
This prevents proper testing of pinch-zoom as the limits change on every zoom
and limits are used to calculate the main frame size in virtual-viewport pinch
to zoom. This is part of a 3-sided patch:
1) Add a setPageScaleFactorLimits to EventSender
2) Change existing layout tests that use setPageScaleFactor to use this method
to set up the limits.
3) This patch removes the setPageScaleLimits call inside setPageScaleFactor.
BUG=435151
Review URL: https://codereview.chromium.org/
738463003
Cr-Commit-Position: refs/heads/master@{#305084}