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This CL changes the CCT overflow menu as follows:

1. The top action icon buttons in the toolbar would be always fixed
i.e non customisable to:

  a) Forward
  b) Page Info
  c) Refresh only
  d) Bookmarks

2. The menu items in the toolbar would be always fixed i.e non
customisable to:

  a) Find in page
  b) Desktop site
  c) Translate
  d) Share (this would be hidden by default, unless specified.)

This CL also adds instrumentation tests and refactors some code out
from CustomTabActivityTest to CustomTabsTestUtils which was needed
to avoid duplication in the CustomTabActivityIncognitoTest.

Bug: 1104180
Change-Id: I6c3d44cd3a32b7437a67bac0c66f894e4d2d62ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2338935
Commit-Queue: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797356}