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This CL converts PreviewsResourceLoadingHintsReceiver{AssociatedPtr,
Ptr, AssociatedRequest, Request} in content to the new Mojo types.

Bug: 955171, 978694
Change-Id: I9a2634259b9a737d775922bd0c8202914ea171e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1783686
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693892}