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

util/posix/symbolic_constants_posix_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/posix/symbolic_constants_posix.h"
 
 #include <sys/signal.h>
 
 #include "base/basictypes.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 
 #define NUL_TEST_DATA(string) { string, arraysize(string) - 1 }
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 const struct {
   int signal;
   const char* full_name;
   const char* short_name;
 } kSignalTestData[] = {
     {SIGABRT, "SIGABRT", "ABRT"},
     {SIGALRM, "SIGALRM", "ALRM"},
     {SIGBUS, "SIGBUS", "BUS"},
     {SIGCHLD, "SIGCHLD", "CHLD"},
     {SIGCONT, "SIGCONT", "CONT"},
@@ skipping 205 matching lines @@
         base::StringPiece("SIGBUST", 6), kAllowFullName, true, SIGBUS);
   }
   {
     SCOPED_TRACE("trailing_NUL_short");
     TestStringToSignal(
         base::StringPiece("BUST", 3), kAllowShortName, true, SIGBUS);
   }
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad