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This CL also moves some custom IPH code from ToolbarManager to
ToolbarButtonInProductHelpController.

Bug: 865801
Change-Id: I49ea9a8954c17be39d99e598208a5b4e78f9fa31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995466
Commit-Queue: Patrick Noland <pnoland@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734048}