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This CL removes the ChildLocalSurfaceIdAllocator on the Blink
main thread. Instead, RenderWidget::DidAutoResize requests a new
LocalSurfaceId from the impl thread and continues to use the
current LocalSurfaceId provided by the parent.

A test was removed that was intended for the pre-child-allocation
code path and another was simplified to verify that DidAutoResize
requests a new LocalSurfaceId. A separate unit test verifies that
the request goes from LayerTreeHost to LayerTreeFrameSink.

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I8e11ac681aee1c5ea7fa6406d3c6cfd806b79986
Reviewed-on: https://chromium-review.googlesource.com/1051868Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557669}