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This is the first step of removing another use of Native App Whitelist
Manager. At this time, the Native App is only used for checking whether
certain Google native iOS apps are installed. This CL creates a new
null-implementation API in ChromeBrowserProvider for doing just that.

The next several steps will be
- implementing this API downstream
- switch upstream to use this new API
- remove GetNativeAppWhitelistManager() API

Bug: 742617
Change-Id: I6553a85743f1328ff8d6f5fca2a466af53d9a393
Reviewed-on: https://chromium-review.googlesource.com/571313
Commit-Queue: Peter Lee <pkl@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486873}