Revert of Ensuring interception of stream get determined by plugin path before  checking mime type. (patchset #16 id:300001 of https://codereview.chromium.org/953793003/)

Reason for revert:
Need  to fix some more logic for r475390.
Once that will get fixed , I will re land this patch again.

Original issue's description:
> Ensuring interception of stream get determined by plugin path before checking mime type.
>
> Earlier we are checking whether a extension with url that have mime type
> should be intercepted as stream by checking plugin availablity.
> Now we are passing plugin path and then checking whether their is
> MimehandlerView Plugin available with that path and then we are allowing
> intercepted as stream. So now interception is not depends upon mimetype.
>
> BUG=443466
>
> Committed: https://crrev.com/d7d1167121bfe4b80d2cdf7559171aeff25c02c6
> Cr-Commit-Position: refs/heads/master@{#324187}

TBR=jochen@chromium.org,jam@chromium.org,mmenke@chromium.org,raymes@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=443466

Review URL: https://codereview.chromium.org/1081013002

Cr-Commit-Position: refs/heads/master@{#324841}
9 files changed