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This CL extracts ChromeContextMenuPopulator's native methods into a
separate class, ChromeContextMenuNativeDelegate. This class implements
an interface, ContextMenuNativeDelegate, that is referenced from other
classes without depending on the populator.

Bug: 1137469
Change-Id: If111e8e40af011566271040ca1ad3a18fc81c915
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462047Reviewed-by: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/master@{#816327}