Make ASAN happy. Do not call setGamepadProvider on null pointer.

content/shell/renderer/test_runner/gamepad_controller.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/shell/renderer/test_runner/gamepad_controller.h"
 
 #include "content/shell/renderer/test_runner/TestInterfaces.h"
 #include "content/shell/renderer/test_runner/WebTestDelegate.h"
 #include "gin/arguments.h"
 #include "gin/handle.h"
@@ skipping 136 matching lines @@
 
 void GamepadController::Reset() {
   memset(&gamepads_, 0, sizeof(gamepads_));
 }
 
 void GamepadController::Install(WebFrame* frame) {
   GamepadControllerBindings::Install(weak_factory_.GetWeakPtr(), frame);
 }
 
 void GamepadController::SetDelegate(WebTestDelegate* delegate) {
+  if (!delegate)
+    return;
   delegate->setGamepadProvider(this);
 }
 
 void GamepadController::SampleGamepads(blink::WebGamepads& gamepads) {
   memcpy(&gamepads, &gamepads_, sizeof(blink::WebGamepads));
 }
 
 void GamepadController::SetGamepadListener(
     blink::WebGamepadListener* listener) {
   listener_ = listener;
@@ skipping 69 matching lines @@
 
 void GamepadController::SetAxisData(int index, int axis, double data) {
   if (index < 0 || index >= static_cast<int>(WebGamepads::itemsLengthCap))
     return;
   if (axis < 0 || axis >= static_cast<int>(WebGamepad::axesLengthCap))
     return;
   gamepads_.items[index].axes[axis] = data;
 }
 
 }  // namespace content