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

util/mac/mach_o_image_reader_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,
@@ skipping 18 matching lines @@
 #include "gtest/gtest.h"
 #include "util/mac/mach_o_image_segment_reader.h"
 #include "util/mac/process_reader.h"
 #include "util/mac/process_types.h"
 #include "util/misc/uuid.h"
 #include "util/test/mac/dyld.h"
 
 // This file is responsible for testing MachOImageReader,
 // MachOImageSegmentReader, and MachOImageSymbolTableReader.
 
+namespace crashpad {
+namespace test {
 namespace {
 
-using namespace crashpad;
-
 // Native types and constants, in cases where the 32-bit and 64-bit versions
 // are different.
 #if defined(ARCH_CPU_64_BITS)
 typedef mach_header_64 MachHeader;
 const uint32_t kMachMagic = MH_MAGIC_64;
 typedef segment_command_64 SegmentCommand;
 const uint32_t kSegmentCommand = LC_SEGMENT_64;
 typedef section_64 Section;
 typedef nlist_64 Nlist;
 #else
@@ skipping 599 matching lines @@
       expected_uuid.InitializeFromBytes(dyld_image->imageUUID);
       UUID actual_uuid;
       image_reader.UUID(&actual_uuid);
       EXPECT_EQ(expected_uuid, actual_uuid);
     }
   }
 #endif
 }
 
 }  // namespace
+}  // namespace test
+}  // namespace crashpad