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This CL converts BindingSet to ReceiverSet in CompositingModeReporterImpl.
According to the change, |bindings| is changed to |receivers| and
BindingRequest() is changed to BindReceiver() as well.

Bug: 955171
Change-Id: I69d2a4f05101ac1c92a844fe5c5946099a4c6205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803939
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697453}