Update InterceptingResourceHandler tests to use MockResourceLoader.

content/browser/loader/mock_resource_loader.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/loader/mock_resource_loader.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
@@ skipping 197 matching lines @@
   }
   return status_;
 }
 
 void MockResourceLoader::WaitUntilIdleOrCanceled() {
   if (status_ == Status::IDLE || status_ == Status::CANCELED)
     return;
   EXPECT_FALSE(canceled_or_idle_run_loop_);
   canceled_or_idle_run_loop_.reset(new base::RunLoop());
   canceled_or_idle_run_loop_->Run();
+  canceled_or_idle_run_loop_.reset();
   EXPECT_TRUE(status_ == Status::IDLE || status_ == Status::CANCELED);
 }
 
 void MockResourceLoader::Cancel() {
   CancelWithError(net::ERR_ABORTED);
 }
 
 void MockResourceLoader::CancelAndIgnore() {
   NOTREACHED();
 }
@@ skipping 18 matching lines @@
 }
 
 void MockResourceLoader::Resume() {
   EXPECT_EQ(Status::CALLBACK_PENDING, status_);
   status_ = Status::IDLE;
   if (canceled_or_idle_run_loop_)
     canceled_or_idle_run_loop_->Quit();
 }
 
 }  // namespace content