Allow retrieval of media device ID salt even after ResourceContext has gone away.

content/browser/renderer_host/media/video_capture_host_unittest.cc

 // Copyright (c) 2012 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 <map>
 #include <string>
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 284 matching lines @@
     ASSERT_TRUE(opened_device_label_.empty());
 
     // Enumerate video devices.
     StreamDeviceInfoArray devices;
     {
       base::RunLoop run_loop;
       std::string label = media_stream_manager_->EnumerateDevices(
           &stream_requester_,
           render_process_id,
           render_view_id,
-          browser_context_.GetResourceContext(),
+          browser_context_.GetResourceContext()->GetMediaDeviceIDSalt(),
           page_request_id,
           MEDIA_DEVICE_VIDEO_CAPTURE,
           security_origin);
       EXPECT_CALL(stream_requester_, DevicesEnumerated(render_view_id,
                                                        page_request_id,
                                                        label,
                                                        _))
           .Times(1).WillOnce(
               DoAll(ExitMessageLoop(message_loop_, run_loop.QuitClosure()),
                     SaveArg<3>(&devices)));
       run_loop.Run();
       Mock::VerifyAndClearExpectations(&stream_requester_);
       media_stream_manager_->CancelRequest(label);
     }
     ASSERT_FALSE(devices.empty());
     ASSERT_EQ(StreamDeviceInfo::kNoId, devices[0].session_id);
 
     // Open the first device.
     {
       base::RunLoop run_loop;
       StreamDeviceInfo opened_device;
       media_stream_manager_->OpenDevice(
           &stream_requester_,
           render_process_id,
           render_view_id,
-          browser_context_.GetResourceContext(),
+          browser_context_.GetResourceContext()->GetMediaDeviceIDSalt(),
           page_request_id,
           devices[0].device.id,
           MEDIA_DEVICE_VIDEO_CAPTURE,
           security_origin);
       EXPECT_CALL(stream_requester_, DeviceOpened(render_view_id,
                                                   page_request_id,
                                                   _,
                                                   _))
           .Times(1).WillOnce(
               DoAll(ExitMessageLoop(message_loop_, run_loop.QuitClosure()),
@@ skipping 161 matching lines @@
 #ifdef DUMP_VIDEO
 TEST_F(VideoCaptureHostTest, CaptureAndDumpVideoVga) {
   CaptureAndDumpVideo(640, 480, 30);
 }
 TEST_F(VideoCaptureHostTest, CaptureAndDump720P) {
   CaptureAndDumpVideo(1280, 720, 30);
 }
 #endif
 
 }  // namespace content