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This prevents a bug which can occurr for URLs that redirect. The bug is a bit
subtle, so see the crbug.com/937581 for more details.

We're almost guaranteed that Chrome hasn't seen a redirect for the final URL,
so this will fix the problem of redirecting before hitting the offline url
loader request interceptor. We will intercept requests for either the original
URL or the final URL.

Note that because we're using a different URL in the intent, when a URL is a
redirect, we will always open the page in a new tab. This is not ideal, but
is preferable to failing to open the page.

Bug: 937581
Change-Id: I04f02556e93eba1ca0b2380313f1052c7f8f7cd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505895
Commit-Queue: Dan H <harringtond@google.com>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638312}