Update rewrite_to_chrome_style tool to also rename methods.

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

 // 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.
 
 namespace blink {
 
 class C {
  public:
   // Make sure initializers are updated to use the new names.
   C() : m_flagField(~0), m_fieldMentioningHTTPAndHTTPS(1) {}
 
   int method() {
     // Test that references to fields are updated correctly.
     return instanceCount + m_flagField + m_fieldMentioningHTTPAndHTTPS;
   }
 
+  // Test that a field without a m_ prefix is correctly renamed.
+  static int instanceCount;
+
  private:
-  // The m_ prefix, if any, should be removed.
-  static int instanceCount;
+  // Test that a field with a m_ prefix is correctly renamed.
   const int m_flagField;
   // Statics should be named with s_, but make sure s_ and m_ are both correctly
   // stripped.
   static int s_staticCount;
   static int m_staticCountWithBadName;
   // Make sure that acronyms don't confuse the underscore inserter.
   int m_fieldMentioningHTTPAndHTTPS;
   // Already Google style, should not change.
   int already_google_style_;
 };
 
 int C::instanceCount = 0;
 
 // Structs are like classes, but don't use a `_` suffix for members.
 struct S {
   int m_integerField;
   int google_style_already;
 };
 
 // Unions also use struct-style naming.
 union U {
   char fourChars[4];
   short twoShorts[2];
   int one_hopefully_four_byte_int;
 };
 
 }  // namespace blink
+
+void F() {
+  // Test that references to a static field are correctly rewritten.
+  blink::C::instanceCount++;
+}