Fix "unreachable code" warnings (MSVC warning 4702), misc. edition.

device/bluetooth/bluetooth_adapter_factory.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 "device/bluetooth/bluetooth_adapter_factory.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 44 matching lines @@
   adapter_callbacks.Get().clear();
 }
 #endif  // defined(OS_WIN)
 
 }  // namespace
 
 namespace device {
 
 // static
 bool BluetoothAdapterFactory::IsBluetoothAdapterAvailable() {
-#if defined(OS_CHROMEOS)
-  return true;
-#elif defined(OS_WIN)
+#if defined(OS_CHROMEOS) || defined(OS_WIN)
   return true;
 #elif defined(OS_MACOSX)
   return base::mac::IsOSLionOrLater();
+#else
+  return false;
 #endif
-  return false;
 }
 
 // static
 void BluetoothAdapterFactory::GetAdapter(const AdapterCallback& callback) {
   if (!default_adapter.Get().get()) {
 #if defined(OS_CHROMEOS)
     chromeos::BluetoothAdapterChromeOS* new_adapter =
         new chromeos::BluetoothAdapterChromeOS();
     default_adapter.Get() = new_adapter->weak_ptr_factory_.GetWeakPtr();
 #elif defined(OS_WIN)
@@ skipping 14 matching lines @@
     adapter_callbacks.Get().push_back(callback);
   }
 }
 
 // static
 scoped_refptr<BluetoothAdapter> BluetoothAdapterFactory::MaybeGetAdapter() {
   return scoped_refptr<BluetoothAdapter>(default_adapter.Get().get());
 }
 
 }  // namespace device