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Since all chromium clients in the renderer now use BrowserInterfaceBroker,
this change marks old methods returning InterfaceProvider* as deprecated.

Bug: 718652

Change-Id: Ie01d60d498e9118f7817ae9a44d2533a848b4b3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020677Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735484}