mac: Only let two-finger-scrolling trigger history if web doesn't swallow gesture

chrome/browser/renderer_host/render_widget_host_view_win.cc

Index: chrome/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/chrome/browser/renderer_host/render_widget_host_view_win.cc b/chrome/browser/renderer_host/render_widget_host_view_win.cc
index 986bbb9c583f9c215ab19123f82eac50883f35b3..fa744d03fa0c92631a7b7ddf3feed5c86ca04672 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_win.cc
+++ b/chrome/browser/renderer_host/render_widget_host_view_win.cc
@@ -764,6 +764,18 @@ void RenderWidgetHostViewWin::SetVisuallyDeemphasized(const SkColor* color,
   InvalidateRect(NULL, FALSE);
 }
 
+void RenderWidgetHostViewWin::UnhandledWheelEvent(
+    const WebKit::WebMouseWheelEvent& event) {
+}
+
+void RenderWidgetHostViewWin::SetHasHorizontalScrollbar(
+    bool has_horizontal_scrollbar) {
+}
+
+void RenderWidgetHostViewWin::SetScrollOffsetPinning(
+    bool is_pinned_to_left, bool is_pinned_to_right) {
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewWin, private: