rewrite_to_chrome_style: tweak macro ignoring logic.

tools/clang/rewrite_to_chrome_style/tests/macros-original.cc

+// Copyright 2016 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.
+
+// Identifiers in macros should never be rewritten, as the risk of things
+// breaking is extremely high.
+
+namespace blink {
+
+#define DEFINE_TYPE_CASTS(thisType, argumentType, argumentName, predicate) \
+  inline thisType* to##thisType(argumentType* argumentName) {              \
+    if (!predicate)                                                        \
+      asm("int 3");                                                        \
+    return static_cast<thisType*>(argumentName);                           \
+  }
+
+#define LIKELY(x) x
+
+struct Base {};
+struct Derived : public Base {};
+
+DEFINE_TYPE_CASTS(Derived, Base, object, true);
+
+void F() {
+  Base* basePtr = new Derived;
+  // 'toDerived' should not be renamed, since the definition lives inside
+  // a macro invocation.
+  Derived* derivedPtr = toDerived(basePtr);
+  // 'derivedPtr' should be renamed: it's a reference to a declaration defined
+  // outside a macro invocation.
+  if (LIKELY(derivedPtr)) {
+    delete derivedPtr;
+  }
+}
+
+}  // namespace blink