Fixed mingw compilation.

Change-Id: I8ae33c752feb19e291e4a3b128d21a0ced883c90
Reviewed-on: https://chromium-review.googlesource.com/220761
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Shannon Woods <shannonwoods@chromium.org>
diff --git a/src/libGLESv2/Framebuffer.h b/src/libGLESv2/Framebuffer.h
index cc12d22..355402c 100644
--- a/src/libGLESv2/Framebuffer.h
+++ b/src/libGLESv2/Framebuffer.h
@@ -14,7 +14,7 @@
 
 #include "common/angleutils.h"
 #include "common/RefCountObject.h"
-#include "constants.h"
+#include "Constants.h"
 
 namespace rx
 {