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This CL is a preparation for building typemapping for
blink::ResourceRequest. In the current code, network.mojom.URLRequest
contains members like |render_frame_id|, |is_main_frame|, etc. In cpp
code, these data are saved in RequestExtraData, while blink::RR keeps
|sharable_extra_data_| as a base class point for RequestExtraData.

As a result, when converting blink::RR to URLRequest, the data saved in
RequestExtraData cannot be reached inside blink/ as RequestExtraData is
a data struct in content/.

This CL try to move data (and corresponding getter/setter), from
RequestExtraData to ExtraData. By doing this, we don't need to touch any
user of these two classes, as we are still keeping the original member
functions' prototype. Then moved data can be touched when making
conversion between blink::RR and network.mojom.URLRequest.

Change-Id: I6995b64ff9da6bef0d70b22b5ec1167bd1e8666f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542727Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Richard Li <richard.li@intel.com>
Cr-Commit-Position: refs/heads/master@{#646616}