Handle Ctrl+Mousewheel after renderer

content/renderer/input/input_handler_proxy.cc

Index: content/renderer/input/input_handler_proxy.cc
diff --git a/content/renderer/input/input_handler_proxy.cc b/content/renderer/input/input_handler_proxy.cc
index 789cb58f26f08cc2904bd29e5deb6f54e3a16c45..bef31ec093988da2673e57e5166be2bca85bd375 100644
--- a/content/renderer/input/input_handler_proxy.cc
+++ b/content/renderer/input/input_handler_proxy.cc
@@ -115,6 +115,13 @@ InputHandlerProxy::EventDisposition InputHandlerProxy::HandleInputEvent(
       // thread, so punt it to the main thread. http://crbug.com/236639
       return DID_NOT_HANDLE;
     }
+#if !defined(OS_MACOSX)
+    if (wheel_event.modifiers & WebInputEvent::ControlKey) {
+      // Ctrl + mousewheel changes zoom on every platform except for Mac,
+      //  see WebContentsImpl::HandleWheelEvent.
+      return DID_NOT_HANDLE;
+    }
+#endif
     cc::InputHandler::ScrollStatus scroll_status = input_handler_->ScrollBegin(
         gfx::Point(wheel_event.x, wheel_event.y), cc::InputHandler::Wheel);
     switch (scroll_status) {