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OnSurfaceDiscarded cosists of two operations:

1. Drop tracking of dependencies of the discarded surface.
2. Unblock surfaces blocked ont he discarded surface.

1. is equivalent to listing all activation dependencies as
'removed_dependencies' and calling OnSurfaceDependenciesChanged.

This CL does just that, reducing the number of lines of code in
SurfaceDependencyTracker further.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I8191f1be81d04cce0c2181ac4fc341ebb8e3cf3f
Bug: 672962
Reviewed-on: https://chromium-review.googlesource.com/1163632
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581016}