This was discovered while auditing the diffs in the native WebKit code between FX 9-dev and 8u-dev. Except for JDK-9-specific build changes there should be no differences, but there are.

diff -u -r /localhome/kcr/javafx/8u-kcr/jfx/rt/modules/web/src/main/native/Source/WebCore/page/java/ChromeClientJava.cpp modules/javafx.web/src/main/native/Source/WebCore/page/java/ChromeClientJava.cpp
--- /localhome/kcr/javafx/8u-kcr/jfx/rt/modules/web/src/main/native/Source/WebCore/page/java/ChromeClientJava.cpp 2016-10-04 08:26:58.072703138 -0700
+++ modules/javafx.web/src/main/native/Source/WebCore/page/java/ChromeClientJava.cpp 2016-10-04 09:01:34.296720318 -0700
@@ -5,7 +5,6 @@
 
 #include "ChromeClientJava.h"
 #if ENABLE(INPUT_TYPE_COLOR)
-#include "ColorChooser.h"
 #include "ColorChooserJava.h"
 #endif
 #include "ContextMenu.h"
diff -u -r /localhome/kcr/javafx/8u-kcr/jfx/rt/modules/web/src/main/native/Source/WebCore/platform/graphics/PathTraversalState.cpp modules/javafx.web/src/main/native/Source/WebCore/platform/graphics/PathTraversalState.cpp
--- /localhome/kcr/javafx/8u-kcr/jfx/rt/modules/web/src/main/native/Source/WebCore/platform/graphics/PathTraversalState.cpp 2016-10-04 08:27:04.488703191 -0700
+++ modules/javafx.web/src/main/native/Source/WebCore/platform/graphics/PathTraversalState.cpp 2016-10-04 09:01:34.296720318 -0700
@@ -280,4 +280,3 @@
 }
 
 }
-