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This CL plumbs PendingSharedURLLoaderFactory to
TrustedVaultConnectionImpl, and address noisy NOTIMPLEMENTED in
TrustedVaultConnectionImpl.

Bug: 1113598
Change-Id: I3287ed4ac1bb4599d1227e9cb90563ce0d650d86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435227
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813738}