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Also change ParseFrameType() return value for invalid frame types.  This
does not matter in SpdyFramer::ValidateFrameHeader(), because the call
to ParseFrameType() is preceeded by a call to IsValidFrameType().

This CL lands server change 143677028 by bnc.

BUG=488484

Review-Url: https://codereview.chromium.org/2619493005
Cr-Commit-Position: refs/heads/master@{#442903}