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Since WebContentsImpl::DidStartLoading/DidStopLoading is already sending
NotifyNavigationStateChanged(INVALIDATE_TYPE_LOAD) by way of
LoadingStateChanged, it's no longer necessary to send this out in
WebContentsImpl::LoadStateChanged. This change can reduce the number
of call of TabStripModelObserver.TabChangedAt with TabChangeType.kAll
a lot to increase performance throughout the browser

Bug: 1112496
Change-Id: I96d8942d7e1ebd5ffc8b3f3389497936f62848c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357960
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798852}