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This CL removes the passed parameter of device_scale_factor and in BrowserPlugin::UpdateDeviceScaleFactor since it's not used.

This CL also removes GetSizeParams because it's only used once.

Repaints are now set whenever the device scale factor changes.

Also remove all calls to .get() on scoped_ptrs which are unnecessary.

BUG=none
TBR=creis@chromium.org for trivial render_view_impl change.

Review URL: https://codereview.chromium.org/528383003

Cr-Commit-Position: refs/heads/master@{#293197}