desktop_capture_device_unittest.cc: Remove dead code.

content/browser/media/capture/desktop_capture_device_unittest.cc

Index: content/browser/media/capture/desktop_capture_device_unittest.cc
diff --git a/content/browser/media/capture/desktop_capture_device_unittest.cc b/content/browser/media/capture/desktop_capture_device_unittest.cc
index 9edd24adabe7272a927df64bf0711f694662ceeb..ac9d3ee89913682af42031c607e9bc9bd837a794 100644
--- a/content/browser/media/capture/desktop_capture_device_unittest.cc
+++ b/content/browser/media/capture/desktop_capture_device_unittest.cc
@@ -36,10 +36,6 @@ namespace content {
 
 namespace {
 
-MATCHER_P2(EqualsCaptureCapability, width, height, "") {
-  return arg.width == width && arg.height == height;
-}
-
 const int kTestFrameWidth1 = 500;
 const int kTestFrameHeight1 = 500;
 const int kTestFrameWidth2 = 400;