Non-Windows build bustage fix from bug 596451 part D - base::SharedMemoryHandle is not available to IPDL on non-Windows, so use typedefs.

dom/plugins/PPluginInstance.ipdl

@@ -55,7 +55,7 @@ using mozilla::plugins::NativeWindowHandle;
 using mozilla::gfxSurfaceType;
 using gfxIntSize;
 using mozilla::null_t;
-using base::SharedMemoryHandle;
+using mozilla::plugins::WindowsSharedMemoryHandle;
 
 namespace mozilla {
 namespace plugins {
@@ -67,7 +67,7 @@ struct SurfaceDescriptorX11 {
 };
 
 struct SurfaceDescriptorWin {
-  SharedMemoryHandle handle;
+  WindowsSharedMemoryHandle handle;
   gfxIntSize size;
 };
 

dom/plugins/PluginMessageUtils.h

@@ -130,6 +130,12 @@ typedef intptr_t NativeWindowHandle; // never actually used, will always be 0
 #error Need NativeWindowHandle for this platform
 #endif
 
+#ifdef XP_WIN
+typedef base::SharedMemoryHandle WindowsSharedMemoryHandle;
+#else
+typedef mozilla::null_t WindowsSharedMemoryHandle;
+#endif
+
 #ifdef MOZ_CRASHREPORTER
 typedef CrashReporter::ThreadId NativeThreadId;
 #else