Use webrtc::DesktopCapturer for screen capturer implementation.

remoting/host/desktop_session_win.cc

Index: remoting/host/desktop_session_win.cc
diff --git a/remoting/host/desktop_session_win.cc b/remoting/host/desktop_session_win.cc
index ddba2ef8dabee168e799eae0a2f5f6b9d4827e80..008f7be86bc23e6266f0ba24b85ee3e038c16807 100644
--- a/remoting/host/desktop_session_win.cc
+++ b/remoting/host/desktop_session_win.cc
@@ -225,26 +225,22 @@ bool RdpSession::Initialize(const ScreenResolution& resolution) {
     return false;
   }
 
-  // DaemonProcess::CreateDesktopSession() verifies that the resolution is
-  // valid.
-  DCHECK(resolution.IsValid());
-
   ScreenResolution local_resolution = resolution;
 
   // If the screen resolution is not specified, use the default screen
   // resolution.
   if (local_resolution.IsEmpty()) {
-    local_resolution.dimensions_.set(kDefaultRdpScreenWidth,
-                                     kDefaultRdpScreenHeight);
-    local_resolution.dpi_.set(kDefaultRdpDpi, kDefaultRdpDpi);
+    local_resolution = ScreenResolution(
+        webrtc::DesktopSize(kDefaultRdpScreenWidth, kDefaultRdpScreenHeight),
+        webrtc::DesktopVector(kDefaultRdpDpi, kDefaultRdpDpi));
   }
 
   // Get the screen dimensions assuming the default DPI.
-  SkISize host_size = local_resolution.ScaleDimensionsToDpi(
-      SkIPoint::Make(kDefaultRdpDpi, kDefaultRdpDpi));
+  webrtc::DesktopSize host_size = local_resolution.ScaleDimensionsToDpi(
+      webrtc::DesktopVector(kDefaultRdpDpi, kDefaultRdpDpi));
 
   // Make sure that the host resolution is within the limits supported by RDP.
-  host_size = SkISize::Make(
+  host_size = webrtc::DesktopSize(
       std::min(kMaxRdpScreenWidth,
                std::max(kMinRdpScreenWidth, host_size.width())),
       std::min(kMaxRdpScreenHeight,