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This CL migrate the legacy ResetDone IPC message to the new Mojo
in BlinkTestClient interface.

This CL adds a |is_secondary_window_| flag to WebTestRenderFrameObserver
to avoid calling ResetDone twice when a secondary window exists. Then,
it's passed to BlinkTestRunner::DidCommitNavigationInMainFrame to avoid
calling ResetDone twice. Because twice calls of ResetDone can cause a
crash during the web test.

Bug: 1039247
Change-Id: Ia992616449ec54d1e28d2a6804f907cfac404cf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2009595Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#738004}