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This reverts commit 653f075d.

Reason for revert: Consistent failures on Linux:
https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests
The first failure:
https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests/87279

Original change's description:
> Clear the subresource redirect hints when navigation is started
> 
> RenderFrames could be reused for same-origin navigations. This causes
> the hints from previous navigations to be used in next navigation
> until the new hints fetch finishes and updates the hints. This CL clears
> the hints.
> 
> Unfortunately this causes race conditions between the image fetch and
> the hints update, which causes images to not redirected to compressed
> versions. So the image fetches are delayed a bit to circumvent this.
> 
> Bug: 1051283
> Change-Id: Ie9e5351e68c0081ab9dbfe23faed2c3c5e8e4d42
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056207
> Commit-Queue: rajendrant <rajendrant@chromium.org>
> Reviewed-by: Michael Crouse <mcrouse@chromium.org>
> Reviewed-by: Tarun Bansal <tbansal@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#742326}

TBR=tbansal@chromium.org,rajendrant@chromium.org,mcrouse@chromium.org

Change-Id: I74441c0600ab5fe5de3016c813590a5d3d21e447
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1051283
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063170Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742550}