Fix compilation if HAVE_WEBRTC_VIDEO is not defined.

talk/media/webrtc/nullwebrtcvideoengine_unittest.cc

Index: talk/media/webrtc/nullwebrtcvideoengine_unittest.cc
diff --git a/talk/media/base/turnutils.h b/talk/media/webrtc/nullwebrtcvideoengine_unittest.cc
similarity index 61%
copy from talk/media/base/turnutils.h
copy to talk/media/webrtc/nullwebrtcvideoengine_unittest.cc
index 47fcebef6eadd198dfdf0f6fb7d635d913ff6516..34e4af5e9e9f08ff91bb69560ff4303206387795 100644
--- a/talk/media/base/turnutils.h
+++ b/talk/media/webrtc/nullwebrtcvideoengine_unittest.cc
@@ -25,23 +25,32 @@
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef TALK_MEDIA_BASE_TURNUTILS_H_
-#define TALK_MEDIA_BASE_TURNUTILS_H_
+#include "testing/gtest/include/gtest/gtest.h"
 
-#include <cstddef>
-#include <cstdint>
+#include "talk/media/webrtc/nullwebrtcvideoengine.h"
+#include "talk/media/webrtc/webrtcvoiceengine.h"
 
 namespace cricket {
 
-struct PacketOptions;
+class WebRtcMediaEngineNullVideo
+    : public CompositeMediaEngine<WebRtcVoiceEngine, NullWebRtcVideoEngine> {
+ public:
+  WebRtcMediaEngineNullVideo(webrtc::AudioDeviceModule* adm,
+                             WebRtcVideoEncoderFactory* encoder_factory,
+                             WebRtcVideoDecoderFactory* decoder_factory) {
+    voice_.SetAudioDeviceModule(adm);
+    video_.SetExternalDecoderFactory(decoder_factory);
+    video_.SetExternalEncoderFactory(encoder_factory);
+  }
+};
 
-// Finds data location within a TURN Channel Message or TURN Send Indication
-// message.
-bool UnwrapTurnPacket(const uint8_t* packet,
-                      size_t packet_size,
-                      size_t* content_position,
-                      size_t* content_size);
+// Simple test to check if NullWebRtcVideoEngine implements the methods
+// required by CompositeMediaEngine.
+TEST(NullWebRtcVideoEngineTest, CheckInterface) {
+  WebRtcMediaEngineNullVideo engine(nullptr, nullptr, nullptr);
 
-}  // namespace cricket
+  EXPECT_TRUE(engine.Init(rtc::Thread::Current()));
+  engine.Terminate();
+}
 
-#endif  // TALK_MEDIA_BASE_TURNUTILS_H_
+}  // namespace cricket