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This would help reduce the size of XML POST update check requests generated
by the update client. Without this change, the update client may generate
requests exceeding the size limit of the update server.

Bug: 722942
Change-Id: I1453e615a2271b8fd376b0706574b22b1d36e26d
Reviewed-on: https://chromium-review.googlesource.com/1033539
Commit-Queue: Minh Nguyen <mxnguyen@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555238}