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PrerenderBrowserTest::request_count_by_path_ is accessed from
MonitorResourceRequest() and GetRequestCount(). These functions are
called from different threads: the UI thread and
EmbeddedTestServer::io_thread_. Therefore, the field should have been
protected by a lock.

Bug: 1158659
Change-Id: I491f7a60b24c4652c4278f46129976eccb81fecd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592289Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836981}