URLRequest::PrepareToRestart() call job_->Kill() and OrphanJob().  But OrphanJob() call job_->Kill() internally, so first Kill() call  in PrepareToRestart() is not needed.  This changelist remove the duplicated Kill() call. 
URLRequest::PrepareToRestart() call job_->Kill() and OrphanJob(). 
But OrphanJob() call job_->Kill() internally, so first Kill() call 
in PrepareToRestart() is not needed. 
This changelist remove the duplicated Kill() call. 

BUG=chromium:69937
TEST=pass net_unittests.

Patch provided by toyoshim@google.com.
Original review: http://codereview.chromium.org/6373002/


Review URL: http://codereview.chromium.org/6250021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@72015 0039d316-1c4b-4281-b951-d872f2087c98

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