rewrite_to_chrome_style: skip nodes in synthesized functions.

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

Index: tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
diff --git a/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc b/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
index 2710d237efcc4d2afd7dc1710e3a49cb22d64084..784fc81b32ae710a6e84fb51a55cc10ab62e65be 100644
--- a/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
+++ b/tools/clang/rewrite_to_chrome_style/tests/fields-original.cc
@@ -4,6 +4,9 @@
 
 namespace blink {
 
+// Note: do not add any copy or move constructors to this class: doing so will
+// break test coverage that we don't clobber the class name by trying to emit
+// replacements for synthesized functions.
 class C {
  public:
   // Make sure initializers are updated to use the new names.
@@ -50,4 +53,8 @@ union U {
 void F() {
   // Test that references to a static field are correctly rewritten.
   blink::C::instanceCount++;
+  // Force instantiation of a copy constructor for blink::C to make sure field
+  // initializers for synthesized functions don't cause weird rewrites.
+  blink::C c;
+  blink::C c2 = c;
 }