[Media Gallery] Added code to support mtp device media file system on Windows.

chrome/browser/media_gallery/mtp_device_delegate_impl.h

Index: chrome/browser/media_gallery/mtp_device_delegate_impl.h
diff --git a/chrome/browser/media_gallery/mtp_device_delegate_impl.h b/chrome/browser/media_gallery/mtp_device_delegate_impl.h
index 5fffdfd2a98b991bf3f509aefd469ed28cd466d6..ada6c9cb6493b92842fdc263bb36f9ebebfbb830 100644
--- a/chrome/browser/media_gallery/mtp_device_delegate_impl.h
+++ b/chrome/browser/media_gallery/mtp_device_delegate_impl.h
@@ -14,6 +14,8 @@
 
 #if defined(OS_LINUX)  // Implies OS_CHROMEOS
 #include "chrome/browser/media_gallery/mtp_device_delegate_impl_linux.h"
+#elif defined(OS_WIN)
+#include "chrome/browser/media_gallery/mtp_device_delegate_impl_win.h"
 #endif
 
 namespace chrome {
@@ -21,6 +23,8 @@ namespace chrome {
 // TODO(kmadhusu): Implement mtp device delegates on other platforms.
 #if defined(OS_LINUX)  // Implies OS_CHROMEOS
 typedef class MtpDeviceDelegateImplLinux MtpDeviceDelegateImpl;
+#elif defined(OS_WIN)
+typedef class MtpDeviceDelegateImplWin MtpDeviceDelegateImpl;
 #endif
 
 }  // namespace chrome