GitLab

Update tests under //chrome/browser/pdf to use
WebContentsConsoleObserver instead of ConsoleObserverDelegate.
This allows us to observe console messages added without overriding
the existing delegate of the WebContents.

Bug: 1034150
Change-Id: I03badfdb5956066553b4d6d278aae6b34ad94715
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316702Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791916}