mac: History swiping doesn't work right with iframes.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 8a6574ff933867c40ee22891a06b7b79f0388215..d80ac1ecb1e43a7d68353368e193bdb34fe855a8 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -158,7 +158,9 @@ static BOOL SupportsBackingPropertiesChangedNotification() {
 
 + (BOOL)shouldAutohideCursorForEvent:(NSEvent*)event;
 - (id)initWithRenderWidgetHostViewMac:(RenderWidgetHostViewMac*)r;
-- (void)gotUnhandledWheelEvent;
+- (void)processedWheelEvent:(const blink::WebMouseWheelEvent&)event
+                   consumed:(BOOL)consumed;
+
 - (void)scrollOffsetPinnedToLeft:(BOOL)left toRight:(BOOL)right;
 - (void)setHasHorizontalScrollbar:(BOOL)has_horizontal_scrollbar;
 - (void)keyEvent:(NSEvent*)theEvent wasKeyEquivalent:(BOOL)equiv;
@@ -2032,12 +2034,13 @@ void RenderWidgetHostViewMac::UnlockMouse() {
     render_widget_host_->LostMouseLock();
 }
 
-void RenderWidgetHostViewMac::UnhandledWheelEvent(
-    const blink::WebMouseWheelEvent& event) {
+void RenderWidgetHostViewMac::ProcessedWheelEvent(
+    const blink::WebMouseWheelEvent& event,
+    bool consumed) {
   // Only record a wheel event as unhandled if JavaScript handlers got a chance
   // to see it (no-op wheel events are ignored by the event dispatcher)
   if (event.deltaX || event.deltaY)
-    [cocoa_view_ gotUnhandledWheelEvent];
+    [cocoa_view_ processedWheelEvent:event consumed:consumed];
 }
 
 bool RenderWidgetHostViewMac::Send(IPC::Message* message) {
@@ -2568,12 +2571,9 @@ bool RenderWidgetHostViewMac::AcceleratedLayerHasNotAckedPendingFrame() const {
   }
 }
 
-- (void)gotUnhandledWheelEvent {
-  if (responderDelegate_ &&
-      [responderDelegate_
-          respondsToSelector:@selector(gotUnhandledWheelEvent)]) {
-    [responderDelegate_ gotUnhandledWheelEvent];
-  }
+- (void)processedWheelEvent:(const blink::WebMouseWheelEvent&)event
+                   consumed:(BOOL)consumed {
+  [responderDelegate_ rendererHandledWheelEvent:event consumed:consumed];
 }
 
 - (void)scrollOffsetPinnedToLeft:(BOOL)left toRight:(BOOL)right {