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Adds mac app_shim targets. Removed a bunch of links from the root BUILD.gn to random targets. These are all pulled in organically now.

Adds crashpad build. Switches components/crash to using it.

Enables content_browsertests, content_perftests, and content_gl_benchmark which now compile.

Add newline to end of keyboard_content_util.cc.

libexif is now a loadable module like in GYP (unit_tests wouldn't load without this).

A few conditions I added checks for mac_views_browser. These are based on how I think it should work, the mac views build doesn't work in GN yet.

BUG=512600

Review URL: https://codereview.chromium.org/1417673004

Cr-Commit-Position: refs/heads/master@{#355500}