Do not release capture when transferring capture between Chrome windows on Linux

ui/events/x/events_x.cc

Index: ui/events/x/events_x.cc
diff --git a/ui/events/x/events_x.cc b/ui/events/x/events_x.cc
index 5216f31effff845645644084a7ece86526a2f78f..f69fc0dc4ff02986c88e928a406a3dcd444e960c 100644
--- a/ui/events/x/events_x.cc
+++ b/ui/events/x/events_x.cc
@@ -536,6 +536,13 @@ int EventButtonFromNative(const base::NativeEvent& native_event) {
          DeviceDataManagerX11::GetInstance()->GetMappedButton(button) : button;
 }
 
+gfx::AcceleratedWidget EventTargetFromNative(
+    const base::NativeEvent& native_event) {
+  return (native_event->type == GenericEvent) ?
+      static_cast<XIDeviceEvent*>(native_event->xcookie.data)->event :
+      native_event->xany.window;
+}
+
 KeyboardCode KeyboardCodeFromNative(const base::NativeEvent& native_event) {
   return KeyboardCodeFromXKeyEvent(native_event);
 }