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

util/stdlib/string_number_conversion_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/stdlib/string_number_conversion.h"
 
 #include "base/basictypes.h"
 #include "gtest/gtest.h"
 
 #include <limits>
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 TEST(StringNumberConversion, StringToInt) {
   const struct {
     const char* string;
     bool valid;
     int value;
   } kTestData[] = {
       {"", false, 0},
       {"0", true, 0},
       {"1", true, 1},
       {"2147483647", true, std::numeric_limits<int>::max()},
@@ skipping 173 matching lines @@
   base::StringPiece input_string(input, arraysize(input) - 1);
   unsigned int output;
   EXPECT_FALSE(StringToNumber(input_string, &output));
 
   // Ensure that a NUL is not required at the end of the string.
   EXPECT_TRUE(StringToNumber(base::StringPiece("66", 1), &output));
   EXPECT_EQ(6u, output);
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad