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

chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm

Index: chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
diff --git a/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm b/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
index a6b260fbd4a75905f18e445f9faf1c151f3e5931..c862b86330bc9b8431fc2e030cc0b6f250fac10e 100644
--- a/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
+++ b/chrome/browser/renderer_host/chrome_render_widget_host_view_mac_delegate.mm
@@ -106,19 +106,12 @@ class SpellCheckObserver : public content::WebContentsObserver {
   return [historySwiper_ handleEvent:event];
 }
 
-// Notification that a wheel event was unhandled.
-- (void)gotUnhandledWheelEvent {
-  [historySwiper_ gotUnhandledWheelEvent];
-}
-
 // Notification of scroll offset pinning.
 - (void)scrollOffsetPinnedToLeft:(BOOL)left toRight:(BOOL)right {
-  [historySwiper_ scrollOffsetPinnedToLeft:left toRight:right];
 }
 
 // Notification of whether the view has a horizontal scrollbar.
 - (void)setHasHorizontalScrollbar:(BOOL)has_horizontal_scrollbar {
-  [historySwiper_ setHasHorizontalScrollbar:has_horizontal_scrollbar];
 }
 
 // NSWindow events.
@@ -207,6 +200,11 @@ class SpellCheckObserver : public content::WebContentsObserver {
   return NO;
 }
 
+- (void)rendererHandledWheelEvent:(const blink::WebMouseWheelEvent&)event
+                         consumed:(BOOL)consumed {
+  [historySwiper_ rendererHandledWheelEvent:event consumed:consumed];
+}
+
 // Spellchecking methods
 // The next five methods are implemented here since this class is the first
 // responder for anything in the browser.