Make URLRequest::Read to return net errors or bytes read instead of a bool

net/url_request/url_request_file_dir_job_unittest.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 "net/url_request/url_request_file_dir_job.h"
 
 #include <memory>
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 64 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(TestJobFactory);
 };
 
 class TestDirectoryURLRequestDelegate : public TestDelegate {
  public:
   TestDirectoryURLRequestDelegate() {}
 
   ~TestDirectoryURLRequestDelegate() override {}
 
-  void OnResponseStarted(URLRequest* request) override {
+  void OnResponseStarted(URLRequest* request, int net_error) override {
     got_response_started_ = true;
   }
 
   bool got_response_started() const { return got_response_started_; }
 
  private:
   bool got_response_started_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(TestDirectoryURLRequestDelegate);
 };
@@ skipping 152 matching lines @@
   ASSERT_GT(delegate.bytes_received(), 0);
   ASSERT_LE(delegate.bytes_received(), kBufferSize);
   EXPECT_TRUE(delegate.data_received().find(
                   directory.path().BaseName().MaybeAsASCII()) !=
               std::string::npos);
 }
 
 }  // namespace
 
 }  // namespace net