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The code used a view routing ID to access the appropriate WebFrame.
It is more appropriate to lookup via the frame token.

BUG=1155202

Change-Id: I364525848a2cb37343814216598724040acbf0ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572042Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833414}