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URLLoaderClientImpl is an implementation of
network::mojom::URLLoaderClient and used by ResourceDispatcher only to
receives messages from a single URLLoader, it couples with the
ResourceDispatcher tightly.

As part of the OnionSoup project, this patch implements:

1. Moves URLLoaderClientImpl to third_party/blink/public/platform/
and decouples it from the ResourceDispatcher by adding an interface of
WebURLLoaderClientObserver.

2. Moves url_loader_client_impl_unittest.cc into blink and decouples
it from the dependency of TestRequestPeer by implementing a
MockWebURLLoaderClientObserver that mostly inherits the functionality of
TestRequestPeer. So, after this patch, the TestRequestPeer will be
only used by the unit test of ResourceDispatcher and could be removed
with the ResourceDispatcher together eventually.

Change-Id: I08793d58623713ee1fc40f9e2395e19ea141f952
Bug: 1110032
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560678Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Cr-Commit-Position: refs/heads/master@{#834642}