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

util/numeric/checked_range_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/checked_range.h"
 
 #include <stdint.h>
 
 #include <limits>
 
 #include "base/basictypes.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(CheckedRange, IsValid) {
   const struct UnsignedTestData {
     uint32_t base;
     uint32_t size;
     bool valid;
   } kUnsignedTestData[] = {
       {0, 0, true},
       {0, 1, true},
       {0, 2, true},
       {0, 0x7fffffff, true},
@@ skipping 198 matching lines @@
                                     testcase.base,
                                     testcase.size));
 
     CheckedRange<uint32_t> child_range(testcase.base, testcase.size);
     ASSERT_TRUE(child_range.IsValid());
     EXPECT_EQ(testcase.valid, parent_range.ContainsRange(child_range));
   }
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad