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This CL removes the background color on the blur content view.

Bug: 821375
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2378bb075927bf5ba7ffd8a7a69bbc90c5328377
Reviewed-on: https://chromium-review.googlesource.com/960036
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542800}