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Removed the keyboard bounding rectangle from geometrychange event.
The keyboard rectangle is now a property of virtualKeyboard object.
It gets updated when the geometrychange event is fired. The keyboard
rectangle can also be captured from CSS env variables:
https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/VirtualKeyboardAPI/explainer.md#virtual-keyboard-visibility-change-css-environment-variables
This was also a feedback from TAG: https://github.com/w3ctag/design-reviews/issues/507#issuecomment-665473068

Bug: 1127749

Change-Id: Id7f19b0e091b820fa45ba4181d482559846d40ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466402
Commit-Queue: Anupam Snigdha <snianu@microsoft.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816395}