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This change removes OnInterfaceRequestFromFrame overrides from the
following WebContentsObserver subclasses:

- AwRenderViewHostExt
- PaymentRequestBrowserTestBase
- ExtensionWebContentsObserver

These overrides are no longer used after the BrowserInterfaceBroker
migration.

Also marks WebContentsObserver::OnInterfaceRequestFromFrame
as deprecated.

Bug: 1035522
Change-Id: Ie870ecf28e27dd28af18480a38b01ab56927742f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107700Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751431}