events: Change gesture-event handler in EventHandler to not return any values.

chrome/browser/ui/views/browser_action_view.cc

Index: chrome/browser/ui/views/browser_action_view.cc
diff --git a/chrome/browser/ui/views/browser_action_view.cc b/chrome/browser/ui/views/browser_action_view.cc
index dbf82787076fa9cd5a14b9fbf78d251cd2678096..65ce7ac4e994979abdb3b7a1918849ab7b9b5d30 100644
--- a/chrome/browser/ui/views/browser_action_view.cc
+++ b/chrome/browser/ui/views/browser_action_view.cc
@@ -345,9 +345,11 @@ bool BrowserActionButton::OnKeyReleased(const ui::KeyEvent& event) {
                      TextButton::OnKeyReleased(event);
 }
 
-ui::EventResult BrowserActionButton::OnGestureEvent(ui::GestureEvent* event) {
-  return IsPopup() ? MenuButton::OnGestureEvent(event) :
-                     TextButton::OnGestureEvent(event);
+void BrowserActionButton::OnGestureEvent(ui::GestureEvent* event) {
+  if (IsPopup())
+    MenuButton::OnGestureEvent(event);
+  else
+    TextButton::OnGestureEvent(event);
 }
 
 bool BrowserActionButton::AcceleratorPressed(