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This is currently causing a top crasher; tfarina@ rebuilt on a branch
without this patch and have confirmed that reverting it fixes the crash.

Reverting at the request of the TPMs.

> Fix WebURLLoaderImpl::Context leak if a pending request is canceled.
> 
> Now, ResourceDispatcher::CancelPendingRequest will send
> ResourceHostMsg_CancelRequest and trigger OnRequestComplete. However,
> the request is pending and thus OnRequestComplete will be queued.
> 
> There are at least two problems if OnRequestComplete is not called:
> 1. WebURLLoaderImpl::Context will never be released.
> 2. request_info->buffer leaks. The buffer holds shared memory handle
>    (file descriptor). fd leaking may lead to HW video decode failure on
>    ChromeOS (detail in chrome-os-partner:27911#63)
> 
> This issue is similar to issue 328092.
> 
> BUG=chrome-os-partner:27911,chromium:369221,chromium:369128
> R=jam@chromium.org, mmenke@chromium.org
> 
> Review URL: https://codereview.chromium.org/268423002

BUG=372342
TBR=kcwu@chromium.org

Review URL: https://codereview.chromium.org/293823002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271504 0039d316-1c4b-4281-b951-d872f2087c98