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Follow up CLs will merge AssistantWebView into
AssistantWebContainerView. This will simplify things as well as free up
the name AssistantWebView for AssistantWebView2 to use.

Bug: b:148080975
Change-Id: If8dcc64142b132417257d56db3f45d5c9f707bec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032567
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737575}