Pass correct length value in WebGamepads

content/browser/gamepad/gamepad_platform_data_fetcher_win.cc

 // Copyright (c) 2012 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/browser/gamepad/gamepad_platform_data_fetcher_win.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/win/windows_version.h"
 #include "content/common/gamepad_hardware_buffer.h"
@@ skipping 79 matching lines @@
         pad_state_[i].raw_input_handle == handle)
       return true;
   }
   return false;
 }
 
 void GamepadPlatformDataFetcherWin::EnumerateDevices(
     WebGamepads* pads) {
   TRACE_EVENT0("GAMEPAD", "EnumerateDevices");
 
+  pads->length = 0;
   // Mark all disconnected pads DISCONNECTED.
   for (size_t i = 0; i < WebGamepads::itemsLengthCap; ++i) {
     if (!pads->items[i].connected)
       pad_state_[i].status = DISCONNECTED;
   }
 
   for (size_t i = 0; i < XUSER_MAX_COUNT; ++i) {
     if (HasXInputGamepad(i))
       continue;
     int pad_index = FirstAvailableGamepadId();
@@ skipping 203 matching lines @@
     return false;
   xinput_get_state_ = reinterpret_cast<XInputGetStateFunc>(
       xinput_dll_.GetFunctionPointer("XInputGetState"));
   if (!xinput_get_state_)
     return false;
   xinput_enable_(true);
   return true;
 }
 
 }  // namespace content