Delay instantiating InputDeviceCapabilities until accessed.

third_party/WebKit/Source/core/input/MouseEventManager.h

Index: third_party/WebKit/Source/core/input/MouseEventManager.h
diff --git a/third_party/WebKit/Source/core/input/MouseEventManager.h b/third_party/WebKit/Source/core/input/MouseEventManager.h
index 0628dfb560b3d60734fda8e5d07b4390c66952db..e3204bca6b4089e4a2dc874d42eb6833ba5a304e 100644
--- a/third_party/WebKit/Source/core/input/MouseEventManager.h
+++ b/third_party/WebKit/Source/core/input/MouseEventManager.h
@@ -8,6 +8,7 @@
 #include "core/CoreExport.h"
 #include "core/dom/SynchronousMutationObserver.h"
 #include "core/input/BoundaryEventDispatcher.h"
+#include "core/input/InputDeviceCapabilities.h"
 #include "core/page/DragActions.h"
 #include "core/page/EventWithHitTestResults.h"
 #include "platform/Timer.h"
@@ -24,7 +25,6 @@ class DataTransfer;
 class Element;
 class FloatQuad;
 class HitTestResult;
-class InputDeviceCapabilities;
 class LocalFrame;
 class ScrollManager;
 
@@ -80,7 +80,7 @@ class CORE_EXPORT MouseEventManager final
 
   WebInputEventResult handleMouseFocus(
       const HitTestResult&,
-      InputDeviceCapabilities* sourceCapabilities);
+      const InputDeviceCapabilitiesValue& sourceCapabilities);
 
   void fakeMouseMoveEventTimerFired(TimerBase*);