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This CL renames PrerenderTabHelper to NoStatePrefetchTabHelper. See the
design doc for the overall plan:
https://docs.google.com/document/d/1e_8buEEhqgY72R2_kjGC3ChBRbA9lt5jEAZr8RLc-5Q/edit?usp=sharing

Bug: 1144577
Change-Id: I5629d556e5a5269da007f1fa32a36d0e2ce48fe6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2516679Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823892}