Mac: Ensure that Mach messages always get a reply

content/browser/browser_io_surface_manager_mac.h

Index: content/browser/browser_io_surface_manager_mac.h
diff --git a/content/browser/browser_io_surface_manager_mac.h b/content/browser/browser_io_surface_manager_mac.h
index 028bde987265cd0826d3f5fc8833a6bd87a8506c..590913458c9504b52574a8484a73cbadf7b24ecc 100644
--- a/content/browser/browser_io_surface_manager_mac.h
+++ b/content/browser/browser_io_surface_manager_mac.h
@@ -79,12 +79,12 @@ class CONTENT_EXPORT BrowserIOSurfaceManager : public IOSurfaceManager {
   void HandleRequest();
 
   // Message handlers that are invoked from HandleRequest.
-  bool HandleRegisterIOSurfaceRequest(
+  void HandleRegisterIOSurfaceRequest(
       const IOSurfaceManagerHostMsg_RegisterIOSurface& request,
       IOSurfaceManagerMsg_RegisterIOSurfaceReply* reply);
   bool HandleUnregisterIOSurfaceRequest(
       const IOSurfaceManagerHostMsg_UnregisterIOSurface& request);
-  bool HandleAcquireIOSurfaceRequest(
+  void HandleAcquireIOSurfaceRequest(
       const IOSurfaceManagerHostMsg_AcquireIOSurface& request,
       IOSurfaceManagerMsg_AcquireIOSurfaceReply* reply);