Windows build fix: Only depend on views_bridge_mac in mac builds

views_bridge_mac now uses a function called CreateWindow which happens
to be a macro in Win32 APIs. If a Windows builds sees that function
and knows about the macro, the build breaks, as just happened in
jumbo builds after
https://chromium-review.googlesource.com/c/chromium/src/+/1226251

TBR=ellyjones@chromium.org

Bug: 859152
Change-Id: Ia2314b7697aa75f8df60310cc504848b86c3ed05
Reviewed-on: https://chromium-review.googlesource.com/1229675
Reviewed-by: Daniel Bratell <bratell@opera.com>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#591986}
2 files changed