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The number of conversation starters should not exceed our stated max.
Note that this CL also updates names of some unittests which contained
"_" in their names (which is discouraged).

Bug: b:148246719
Change-Id: I01ea72c5ba5967ec489a170c5a6a799de56a731b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031666Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#737116}