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users.

In Google Chrome-branded builds, show an infobar at startup to users with
32-bit-only systems, and add a message to the about page for those users
advising that automatic updates will soon stop because the system
configuration is about to become unsupported.

A provision is made to change this message to an "end-of-the-line" message for
the final 32-bit-compatible build. When this switch is flipped, the autoupdate
status and promotion button on the about page will be hidden. The
"end-of-the-line" message will appear there, alongside the icon normally used
for failed updates. The startup infobar text will change at that point as
well.

No observable changes for non-branded Chromium builds (since they're not
receiving updates through this mechanism) or for users with 64-bit-capable
systems (because they're not being obsoleted).

R=arv@chromium.org, thakis@chromium.org, thakis
BUG=303280,331810,331830

Review URL: https://codereview.chromium.org/125443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245598 0039d316-1c4b-4281-b951-d872f2087c98