Fix unused lambda captures in base/

base/bind_unittest.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 "base/bind.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 1223 matching lines @@
 TEST_F(BindTest, CapturelessLambda) {
   EXPECT_FALSE(internal::IsConvertibleToRunType<void>::value);
   EXPECT_FALSE(internal::IsConvertibleToRunType<int>::value);
   EXPECT_FALSE(internal::IsConvertibleToRunType<void(*)()>::value);
   EXPECT_FALSE(internal::IsConvertibleToRunType<void(NoRef::*)()>::value);
 
   auto f = []() {};
   EXPECT_TRUE(internal::IsConvertibleToRunType<decltype(f)>::value);
 
   int i = 0;
-  auto g = [i]() {};
+  auto g = [i]() { (void)i; };
   EXPECT_FALSE(internal::IsConvertibleToRunType<decltype(g)>::value);
 
   auto h = [](int, double) { return 'k'; };
   EXPECT_TRUE((std::is_same<
       char(int, double),
       internal::ExtractCallableRunType<decltype(h)>>::value));
 
   EXPECT_EQ(42, Bind([] { return 42; }).Run());
   EXPECT_EQ(42, Bind([](int i) { return i * 7; }, 6).Run());
 
@@ skipping 155 matching lines @@
 
 // Test null callbacks cause a DCHECK.
 TEST(BindDeathTest, NullCallback) {
   base::Callback<void(int)> null_cb;
   ASSERT_TRUE(null_cb.is_null());
   EXPECT_DCHECK_DEATH(base::Bind(null_cb, 42));
 }
 
 }  // namespace
 }  // namespace base