Bug 1358372: Part 1 - Move Windows content process AudioSession init before sandbox lowering r=jimm

Something about setting the grouping parameter was harmed by the sandbox.

dom/ipc/ContentParent.cpp

@@ -2382,6 +2382,17 @@ ContentParent::InitInternal(ProcessPriority aInitialPriority,
     }
   }
 
+#if defined(XP_WIN)
+  // Send the info needed to join the browser process's audio session.
+  nsID id;
+  nsString sessionName;
+  nsString iconPath;
+  if (NS_SUCCEEDED(mozilla::widget::GetAudioSessionData(id, sessionName,
+                                                        iconPath))) {
+    Unused << SendSetAudioSessionData(id, sessionName, iconPath);
+  }
+#endif
+
 #ifdef MOZ_CONTENT_SANDBOX
   bool shouldSandbox = true;
   MaybeFileDesc brokerFd = void_t();
@@ -2413,16 +2424,6 @@ ContentParent::InitInternal(ProcessPriority aInitialPriority,
     KillHard("SandboxInitFailed");
   }
 #endif
-#if defined(XP_WIN)
-  // Send the info needed to join the browser process's audio session.
-  nsID id;
-  nsString sessionName;
-  nsString iconPath;
-  if (NS_SUCCEEDED(mozilla::widget::GetAudioSessionData(id, sessionName,
-                                                        iconPath))) {
-    Unused << SendSetAudioSessionData(id, sessionName, iconPath);
-  }
-#endif
 
   {
     RefPtr<ServiceWorkerRegistrar> swr = ServiceWorkerRegistrar::Get();