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HitTestAsyncQueriedDebugRegion is currently defined in an anonymous
namespace in hit_test_manager.h, so each translation unit gets a
seperate definition of it with internal linkage. I presume the intent
here was to have HitTestAsyncQueriedDebugRegion be private to
HitTestManager, so we now define it accordingly.

Bug: None
Change-Id: Ic546f42f6808ae25ed7f948677e6304c04ef43ec
Reviewed-on: https://chromium-review.googlesource.com/c/1405698Reviewed-by: Ria Jiang <riajiang@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622142}