clang-plugin: Enable RecursiveASTVisitor approach by default.

tools/clang/plugins/ChromeClassTester.cpp

Index: tools/clang/plugins/ChromeClassTester.cpp
diff --git a/tools/clang/plugins/ChromeClassTester.cpp b/tools/clang/plugins/ChromeClassTester.cpp
index a6f9fff9a29a5cd34493aececbdddac0bc9c36e4..2b22ed950ca8c13afa9fff7cd262e45c18d9c682 100644
--- a/tools/clang/plugins/ChromeClassTester.cpp
+++ b/tools/clang/plugins/ChromeClassTester.cpp
@@ -41,18 +41,6 @@ ChromeClassTester::ChromeClassTester(CompilerInstance& instance,
 
 ChromeClassTester::~ChromeClassTester() {}
 
-void ChromeClassTester::HandleTagDeclDefinition(TagDecl* tag) {
-  pending_class_decls_.push_back(tag);
-}
-
-bool ChromeClassTester::HandleTopLevelDecl(DeclGroupRef group_ref) {
-  for (size_t i = 0; i < pending_class_decls_.size(); ++i)
-    CheckTag(pending_class_decls_[i]);
-  pending_class_decls_.clear();
-
-  return true;  // true means continue parsing.
-}
-
 void ChromeClassTester::CheckTag(TagDecl* tag) {
   // We handle class types here where we have semantic information. We can only
   // check structs/classes/enums here, but we get a bunch of nice semantic