Don’t use using directives (“using namespace”) in tests

util/numeric/int128_test.cc

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/numeric/int128.h"
 
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(Int128, UInt128) {
 #if defined(ARCH_CPU_LITTLE_ENDIAN)
   const uint8_t kBytes[] =
       {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
 #else
   const uint8_t kBytes[] =
       {15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0};
 #endif
 
   uint128_struct uint128;
   static_assert(sizeof(uint128) == sizeof(kBytes), "sizes must be equal");
 
   uint128 = bit_cast<uint128_struct>(kBytes);
 
   EXPECT_EQ(0x0706050403020100u, uint128.lo);
   EXPECT_EQ(0x0f0e0d0c0b0a0908u, uint128.hi);
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad