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Add to chrome::mojom::AppShim a CreateContentNSViewBridgeFactory
method. This will instantiate a content::NSViewBridgeFactoryImpl.

The caller of this method (AppShimHost, in the browser), creates
a content::NSViewBridgeFactoryHost to manage this interface. This
may be used (e.g, by content::RenderWidgetHostViewMac::
MigrateNSViewBridge), to create NSViews in an app shim process.

Add content/browser as a dependency of app_shim.

R=dominickn
TBR=avi

Bug: 821651
Change-Id: Ice2b46f2d75a9725f5e8e8ad7d2c05e3d70b18eb
Reviewed-on: https://chromium-review.googlesource.com/1240154
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594987}