Disable Sky compositor again

Turns out this made a bunch of tests crash.

TBR=esprehn@chromium.org

Review URL: https://codereview.chromium.org/748123003
diff --git a/sky/viewer/document_view.h b/sky/viewer/document_view.h
index a5b0e14..ff72208 100644
--- a/sky/viewer/document_view.h
+++ b/sky/viewer/document_view.h
@@ -25,7 +25,7 @@
 #include "sky/viewer/services/inspector_impl.h"
 
 // You can try enabling the Sky compositor, but it's a bit buggy.
-#define ENABLE_SKY_COMPOSITOR 1
+#define ENABLE_SKY_COMPOSITOR 0
 
 namespace base {
 class MessageLoopProxy;