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The underlying EXO surface should only be resized when the main
RenderFrameHost changes. Embedded RHF (eg: iframes) should not cause the
EXO surface to resize.

Bug: b/147835637
Test: On device
Change-Id: I24cab3f2cb99d0b2a3693adc815d445522c1cec8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006420Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732687}