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Currently, resource_load_stats.h/cc defines a collection of methods
collecting histograms related to resource load and notifying with
loading stats. Along with the OnionSoup for loaders, we need these
functions could be available inside Blink.

This patch leverages the mojom interface ResourceLoadInfoNotifier
to notify the loading stats, which is visible in Blink, thus we could
invoke it by sort of blink::URLLoaderClientImpl in the future.

The original functionalities offered by resource_load_stats.h are
splitted into ResourceLoadInfoNotifierWrapper and RenderFrameImpl.
The ResourceLoadInfoNotifierWrapper class is responsible to collect
the histograms and hold a ResourceLoadInfoPtr struct used by the
ResourceLoadInfoNotifier.

After this patch, only NotifyUpdateUserGestureCarryoverInfo() is left
in resource_load_stats.h.

Change-Id: Ib5fd5d774544f771753707c4fffcf0034cd12a01
Bug: 1110032
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402321Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Cr-Commit-Position: refs/heads/master@{#814686}