Enable cropping window capturing for Win7 when Aero is disabled.

webrtc/modules/desktop_capture/cropping_window_capturer_win.cc

Index: webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
diff --git a/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc b/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
index deffe665ee53b6f585d07cba2017268cff593bac..73a2aa9d6ecffb7c2f10884d787f6bb07371ab30 100644
--- a/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
+++ b/webrtc/modules/desktop_capture/cropping_window_capturer_win.cc
@@ -119,10 +119,12 @@ class CroppingWindowCapturerWin : public CroppingWindowCapturer {
   // The region from GetWindowRgn in the desktop coordinate if the region is
   // rectangular, or the rect from GetWindowRect if the region is not set.
   DesktopRect window_region_rect_;
+
+  AeroChecker aero_checker_;
 };
 
 bool CroppingWindowCapturerWin::ShouldUseScreenCapturer() {
-  if (!rtc::IsWindows8OrLater())
+  if (!rtc::IsWindows8OrLater() && aero_checker_.IsAeroEnabled())
     return false;
 
   // Check if the window is a translucent layered window.