[heap] Hide GCTracer inside the heap component.
This prevents leakage of the gc-tracer.h declarations inside of the heap and prevents it from being exposed to the world. Protects private state from being inadvertently mocked with. R=mlippautz@chromium.org Review URL: https://codereview.chromium.org/1294763004 Cr-Commit-Position: refs/heads/master@{#30276}
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