Test dead code.

Test a log method that could be helpful for debugging.  Also inline SpdyPriorityIR constructors for code convergence.

This CL lands server change 87053738 by birenroy.

BUG=

Review URL: https://codereview.chromium.org/988733003

Cr-Commit-Position: refs/heads/master@{#319724}
5 files changed