GitLab

Remove definition from WebWidgetClient because it is used in various
classes that have no concept of the WebWidgetClient.

Stop including web_widget_client.h inside chrome_client.h

Change-Id: I14f6fa28c87054cd1004e078c828a24b817c50f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078592
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745079}