clang/win: Let some chromium_code targets build with -Wextra.

base/process/process_util_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 260 matching lines @@
             base::GetTerminationStatus(process.Handle(), &exit_code));
   EXPECT_EQ(kExpectedStillRunningExitCode, exit_code);
 
   SignalChildren(signal_file.c_str());
   exit_code = 42;
   base::TerminationStatus status =
       WaitForChildTermination(process.Handle(), &exit_code);
   EXPECT_EQ(base::TERMINATION_STATUS_PROCESS_CRASHED, status);
 
 #if defined(OS_WIN)
-  EXPECT_EQ(0xc0000005, exit_code);
+  EXPECT_EQ(static_cast<int>(0xc0000005), exit_code);
 #elif defined(OS_POSIX)
   int signaled = WIFSIGNALED(exit_code);
   EXPECT_NE(0, signaled);
   int signal = WTERMSIG(exit_code);
   EXPECT_EQ(SIGSEGV, signal);
 #endif
 
   // Reset signal handlers back to "normal".
   base::debug::EnableInProcessStackDumping();
   remove(signal_file.c_str());
@@ skipping 828 matching lines @@
   options.current_directory = base::FilePath("/dev/null");
 
   base::Process process(SpawnChildWithOptions("SimpleChildProcess", options));
   ASSERT_TRUE(process.IsValid());
 
   int exit_code = kSuccess;
   EXPECT_TRUE(process.WaitForExit(&exit_code));
   EXPECT_NE(kSuccess, exit_code);
 }
 #endif