Fix presubmit failure.

src/flow-graph.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 613 matching lines @@
   UNREACHABLE();
 }
 
 
 void InstructionPrinter::VisitAssignment(Assignment* expr) {
   Variable* var = expr->target()->AsVariableProxy()->AsVariable();
   Property* prop = expr->target()->AsProperty();
 
   // Print the left-hand side.
   Visit(expr->target());
-  if (var == NULL && prop == NULL) return; // Throw reference error.
+  if (var == NULL && prop == NULL) return;  // Throw reference error.
   PrintF(" = ");
   // For compound assignments, print the left-hand side again and the
   // corresponding binary operator.
   if (expr->is_compound()) {
     PrintSubexpression(expr->target());
     PrintF(" %s ", Token::String(expr->binary_op()));
   }
 
   // Print the right-hand side.
   PrintSubexpression(expr->value());
@@ skipping 111 matching lines @@
   int number = 0;
   for (int i = postorder_.length() - 1; i >= 0; --i) {
     number = postorder_[i]->PrintAsText(number);
   }
 }
 
 #endif  // DEBUG
 
 
 } }  // namespace v8::internal