Fix chromoting windows build

remoting/host/capturer_gdi.cc

Index: remoting/host/capturer_gdi.cc
diff --git a/remoting/host/capturer_gdi.cc b/remoting/host/capturer_gdi.cc
index af32f9b479b3dea3e63ac297bc343c496aae1fb8..35a8c4311e30043bb251209a500704eac82c0c40 100644
--- a/remoting/host/capturer_gdi.cc
+++ b/remoting/host/capturer_gdi.cc
@@ -11,7 +11,7 @@ namespace remoting {
 // 3780 pixels per meter is equivalent to 96 DPI, typical on desktop monitors.
 static const int kPixelsPerMeter = 3780;
 // 24 bit RGB is 3 bytes per pixel.
-static const int kBytesPerPixel = 3;
+static const int kBytesPerPixel = 4;
 
 CapturerGdi::CapturerGdi()
     : initialized_(false) {
@@ -84,7 +84,7 @@ void CapturerGdi::InitializeBuffers() {
   int rounded_width = (width_ + 3) & (~3);
 
   // Dimensions of screen.
-  pixel_format_ = PixelFormatRgb24;
+  pixel_format_ = PixelFormatRgb32;
   bytes_per_pixel_ = kBytesPerPixel;
   bytes_per_row_ = rounded_width * bytes_per_pixel_;