Remove support for generating visualizer format file for the flowgraph.

runtime/vm/il_printer.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_IL_PRINTER_H_
 #define VM_IL_PRINTER_H_
 
 #include "vm/flow_graph.h"
 #include "vm/intermediate_language.h"
 
@@ skipping 42 matching lines @@
                              const AbstractType& dst_type,
                              const String& dst_name,
                              bool eliminated);
 
  private:
   const Function& function_;
   const GrowableArray<BlockEntryInstr*>& block_order_;
   const bool print_locations_;
 };
 
-
-class FlowGraphVisualizer : public ValueObject {
- public:
-  explicit FlowGraphVisualizer(const FlowGraph& flow_graph)
-      : function_(flow_graph.parsed_function().function()),
-        block_order_(flow_graph.reverse_postorder()),
-        indent_(0) { }
-
-  void PrintFunction();
-
- private:
-  // Helpers for printing.
-  void PrintInstruction(Instruction* instr);
-  void Print(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
-
-  const Function& function_;
-  const GrowableArray<BlockEntryInstr*>& block_order_;
-  intptr_t indent_;
-
-  DISALLOW_COPY_AND_ASSIGN(FlowGraphVisualizer);
-};
-
 }  // namespace dart
 
 #endif  // VM_IL_PRINTER_H_