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Previously, we'd invoke them whenever any request was deleted or when a
SpdySession is created. With this CL, we invoke them only when the
first request is deleted or a SpdySession is created. This reduces the
number of PostTasks and searches through std::maps when we have a bunch
of requests all waiting on the creation of the same SpdySession.

Bug: 912727
Change-Id: I5083137cf0726e3b1ddb3ac4608b706121964cbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570914
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652597}