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This update is required for work that is underway related to management
of Chrome browsers for enterprise users.

The google_update_idl.idl file was originally provided by the Google
Update team. It has been modified as described in the README.chromium
file in this CL.

The change was tested with Chrome-branded builds with target_cpu set to
"x86" and "x64". I followed these steps to make sure that this change
does not break Chrome updates.

1. Manully set the version of Chrome in src/chrome/VERSION to a version
   prior to that which is currently served on the Dev channel.
2. Compile with is_chrome_branded=true and target_cpu set to one of
   "x86" or "x64".
3. Install the build as a Dev-channel Chrome using setup.exe on a 64-bit
   Win10 machine.
4. Navigate to chrome://help and make sure that the update process works
   as expected.

Bug: 796270
Change-Id: I6962b8874a7e825d41834860de0eb0fe92f5a6e3
Reviewed-on: https://chromium-review.googlesource.com/924474
Commit-Queue: Ali Tofigh <alito@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539457}