mini_installer: Change to use _countof rather than base's arraysize macro.

chrome/installer/mini_installer/mini_string.cc

Index: chrome/installer/mini_installer/mini_string.cc
diff --git a/chrome/installer/mini_installer/mini_string.cc b/chrome/installer/mini_installer/mini_string.cc
index c5e401a1621f8d03eeeea276e286f1b744c2782e..1f4b3f10294cdcd064782fdaeb70830f481f0e99 100644
--- a/chrome/installer/mini_installer/mini_string.cc
+++ b/chrome/installer/mini_installer/mini_string.cc
@@ -68,8 +68,8 @@ bool SafeStrCopy(wchar_t* dest, size_t dest_size, const wchar_t* src) {
   // failed concatenation.  For example:
   //
   // wchar_t buf[5] = {0};
-  // if (!SafeStrCat(buf, arraysize(buf), kLongName))
-  //   SafeStrCat(buf, arraysize(buf), kShortName);
+  // if (!SafeStrCat(buf, _countof(buf), kLongName))
+  //   SafeStrCat(buf, _countof(buf), kShortName);
   //
   // If we were to return false in the first call to SafeStrCat but still
   // mutate the buffer, the buffer will be in an unexpected state.