Fix use-after-free issue in VideoDecoderResourceTest.

ppapi/proxy/video_decoder_resource_unittest.cc

Index: ppapi/proxy/video_decoder_resource_unittest.cc
diff --git a/ppapi/proxy/video_decoder_resource_unittest.cc b/ppapi/proxy/video_decoder_resource_unittest.cc
index 80c28035d05cd21ea66f424f675a955fdec69b8f..8f80d7a71cefb650939d95cf22f6a112eb032c16 100644
--- a/ppapi/proxy/video_decoder_resource_unittest.cc
+++ b/ppapi/proxy/video_decoder_resource_unittest.cc
@@ -147,13 +147,15 @@ class VideoDecoderResourceTest : public PluginProxyTest {
         &sink(), PpapiHostMsg_VideoDecoder_GetShm::ID, PP_OK, shm_msg_reply);
     sink().AddFilter(&shm_msg_handler);
 
+    std::unique_ptr<base::SharedMemoryHandle> shm_handle;
+    std::unique_ptr<SerializedHandle> serialized_handle;
     base::SharedMemory shm;
     if (expected_shm_msg) {
       shm.CreateAnonymous(kShmSize);
-      base::SharedMemoryHandle shm_handle;
-      shm.ShareToProcess(base::GetCurrentProcessHandle(), &shm_handle);
-      SerializedHandle serialized_handle(shm_handle, kShmSize);
-      shm_msg_handler.set_serialized_handle(&serialized_handle);
+      shm_handle.reset(new base::SharedMemoryHandle());
+      shm.ShareToProcess(base::GetCurrentProcessHandle(), shm_handle.get());
+      serialized_handle.reset(new SerializedHandle(*shm_handle, kShmSize));
+      shm_msg_handler.set_serialized_handle(serialized_handle.get());
     }
 
     memset(decode_buffer_, 0x55, kDecodeBufferSize);