GitLab

The current browser-side navigation code can ask the renderer to commit
a MIME type that it cannot handle. When this happens, the renderer
simply ignores the commit request, tripping the CHECKs added in
https://crrev.com/796508.

For now, allow these commits to silently fail and not commit a new
document...

Bug: 999255, 1115912, 1117282
Change-Id: I435831058db8e059b0389a8e2262f6bd72e875fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360602
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799385}