vdatest: Initialize weak decoder pointer and factory.

content/common/gpu/media/video_decode_accelerator_unittest.cc

Index: content/common/gpu/media/video_decode_accelerator_unittest.cc
diff --git a/content/common/gpu/media/video_decode_accelerator_unittest.cc b/content/common/gpu/media/video_decode_accelerator_unittest.cc
index 87f4d0aa711d84b74dfc0141ae3c6e2f30214efc..913396688672ade9484b0b05238e64d005ba37fa 100644
--- a/content/common/gpu/media/video_decode_accelerator_unittest.cc
+++ b/content/common/gpu/media/video_decode_accelerator_unittest.cc
@@ -540,6 +540,10 @@ void GLRenderingVDAClient::CreateAndStartDecoder() {
   decoder_->TryToSetupDecodeOnSeparateThread(
       weak_this_, base::ThreadTaskRunnerHandle::Get());
 
+  weak_vda_ptr_factory_.reset(
+      new base::WeakPtrFactory<VideoDecodeAccelerator>(decoder_.get()));
+  weak_vda_ = weak_vda_ptr_factory_->GetWeakPtr();
+
   SetState(CS_DECODER_SET);
   FinishInitialization();
 }
@@ -771,7 +775,7 @@ void GLRenderingVDAClient::FinishInitialization() {
 void GLRenderingVDAClient::DeleteDecoder() {
   if (decoder_deleted())
     return;
-  weak_vda_ptr_factory_.reset();
+  weak_vda_ptr_factory_->InvalidateWeakPtrs();
   decoder_.reset();
   STLClearObject(&encoded_data_);
   active_textures_.clear();