Try to unbreak mini_installer build.

chrome/installer/mini_installer/mini_string.h

Index: chrome/installer/mini_installer/mini_string.h
diff --git a/chrome/installer/mini_installer/mini_string.h b/chrome/installer/mini_installer/mini_string.h
index 52833a8087b897905b21a6cf6cc8287cc00ddfd4..23e53dc2b1b6fdf3e5c54f457efe1df811d56ce0 100644
--- a/chrome/installer/mini_installer/mini_string.h
+++ b/chrome/installer/mini_installer/mini_string.h
@@ -6,8 +6,15 @@
 #define CHROME_INSTALLER_MINI_INSTALLER_MINI_STRING_H_
 
 #ifndef COMPILE_ASSERT
-// COMPILE_ASSERT macro borrowed from macros.h
+// Some bots that build mini_installer don't know static_assert.
+#if __cplusplus >= 201103L
 #define COMPILE_ASSERT(expr, msg) static_assert(expr, #msg)
+#else
+template <bool>
+struct CompileAssert {};
+#define COMPILE_ASSERT(expr, msg) \
+  typedef CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
+#endif
 #endif
 
 namespace mini_installer {