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Replacing site URL comparison with a check that compares extension
pointers. This is similar to ProcessManager::GetExtensionForWebContents()
code which appears to be trying to accomplish the same goal. This change
is part of an effort to remove site URL usage across the code base.

Bug: 1085275
Change-Id: Ice16e145849786eabcfbe5fd05861528a2beb8a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2212785
Commit-Queue: Aaron Colwell <acolwell@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Auto-Submit: Aaron Colwell <acolwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818027}