rewrite_to_chrome_style: Handle non-method overloaded operators

tools/clang/rewrite_to_chrome_style/RewriteToChromeStyle.cpp

 // Copyright 2015 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.
 //
 // Changes Blink-style names to Chrome-style names. Currently transforms:
 //   fields:
 //     int m_operationCount => int operation_count_
 //   variables (including parameters):
 //     int mySuperVariable => int my_super_variable
 //   constants:
@@ skipping 381 matching lines @@
   DeclRefRewriter decl_ref_rewriter(&replacements);
   match_finder.addMatcher(decl_ref_matcher, &decl_ref_rewriter);
 
   // Non-method function declarations ========
   // Given
   //   void f();
   //   struct S {
   //     void g();
   //   };
   // matches |f| but not |g|.
-  auto function_decl_matcher =
-      id("decl", functionDecl(unless(cxxMethodDecl()), in_blink_namespace));
+  auto function_decl_matcher = id(
+      "decl",
+      functionDecl(
+          unless(anyOf(
+              // Methods are covered by the method matchers.
+              cxxMethodDecl(),
+              // Out-of-line overloaded operators have special names and should
+              // never be renamed.
+              isOverloadedOperator())),
+          in_blink_namespace));
   FunctionDeclRewriter function_decl_rewriter(&replacements);
   match_finder.addMatcher(function_decl_matcher, &function_decl_rewriter);
 
   // Non-method function references ========
   // Given
   //   f();
   //   void (*p)() = &f;
   // matches |f()| and |&f|.
   auto function_ref_matcher =
       id("expr", declRefExpr(to(function_decl_matcher)));
@@ skipping 106 matching lines @@
   for (const auto& r : replacements) {
     std::string replacement_text = r.getReplacementText().str();
     std::replace(replacement_text.begin(), replacement_text.end(), '\n', '\0');
     llvm::outs() << "r:::" << r.getFilePath() << ":::" << r.getOffset()
                  << ":::" << r.getLength() << ":::" << replacement_text << "\n";
   }
   llvm::outs() << "==== END EDITS ====\n";
 
   return 0;
 }