Switch to standard integer types in base/.

BUG=138542
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NOPRESUBMIT=true

Review URL: https://codereview.chromium.org/1538743002

Cr-Commit-Position: refs/heads/master@{#366910}
diff --git a/base/environment_unittest.cc b/base/environment_unittest.cc
index c955e79b1..77e9717 100644
--- a/base/environment_unittest.cc
+++ b/base/environment_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "base/environment.h"
 #include "base/memory/scoped_ptr.h"
+#include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"