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With this change we are rendering the webview at the correct size,
removing hardcoded strings and showing a "Please wait..." message
while we load the webview.

Bug: 958995
Change-Id: Iaf4c71398d29fdc73daa06cba18e001b9d70e3dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622986Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Lucas Tenório <ltenorio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663160}