Fix compilation if HAVE_WEBRTC_VIDEO is not defined.

talk/media/webrtc/webrtcvideocapturer_unittest.cc

 /*
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+#ifdef HAVE_WEBRTC_VIDEO
+
 #include <stdio.h>
 #include <vector>
 #include "talk/media/base/testutils.h"
 #include "talk/media/base/videocommon.h"
 #include "talk/media/webrtc/fakewebrtcvcmfactory.h"
 #include "talk/media/webrtc/webrtcvideocapturer.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/stringutils.h"
 #include "webrtc/base/thread.h"
@@ skipping 101 matching lines @@
   EXPECT_FALSE(capturer_->IsRunning());
   EXPECT_TRUE(capturer_->GetCaptureFormat() == NULL);
 }
 
 TEST_F(WebRtcVideoCapturerTest, TestCaptureWithoutInit) {
   cricket::VideoFormat format;
   EXPECT_EQ(cricket::CS_NO_DEVICE, capturer_->Start(format));
   EXPECT_TRUE(capturer_->GetCaptureFormat() == NULL);
   EXPECT_FALSE(capturer_->IsRunning());
 }
+
+#endif  // HAVE_WEBRTC_VIDEO