Test theory about didCommitProvisionalLoad crash.

It appears that we're creating a RenderView with both a main frame
routing ID and a proxy routing ID, which shouldn't be possible after
the switch to disable swappedout://.

BUG=575245
TEST=Crash in RenderViewImpl::Initialize instead.

Review URL: https://codereview.chromium.org/1618063003

Cr-Commit-Position: refs/heads/master@{#371009}
1 file changed