Introduce AudioIPCFactory.

content/renderer/pepper/pepper_platform_audio_output_dev.h

Index: content/renderer/pepper/pepper_platform_audio_output_dev.h
diff --git a/content/renderer/pepper/pepper_platform_audio_output_dev.h b/content/renderer/pepper/pepper_platform_audio_output_dev.h
index 50d4537ac9b790e0b500021ca7443b491c14d133..e44dce8affb530256c9a71fc4d8e86e041caad46 100644
--- a/content/renderer/pepper/pepper_platform_audio_output_dev.h
+++ b/content/renderer/pepper/pepper_platform_audio_output_dev.h
@@ -6,6 +6,7 @@
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_DEV_H_
 
 #include <memory>
+#include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -18,14 +19,6 @@ class OneShotTimer;
 class SingleThreadTaskRunner;
 }
 
-namespace {
-#if defined(OS_WIN) || defined(OS_MACOSX)
-const int64_t kMaxAuthorizationTimeoutMs = 4000;
-#else
-const int64_t kMaxAuthorizationTimeoutMs = 0;  // No timeout.
-#endif
-}
-
 namespace content {
 class PepperAudioOutputHost;