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This field is redundant now that we pass a RenderPass* to AppendQuads.

A few tests were passing a different id and the same RenderPass* to
test DelegatedRendererLayerImpl, so I had to adjust the tests to
pass different RenderPass* instead.

R=vmpstr

Review URL: https://codereview.chromium.org/879423002

Cr-Commit-Position: refs/heads/master@{#313630}