refactored SkSL VarDeclaration handling

src/sksl/ir/SkSLStatement.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
  
 #ifndef SKSL_STATEMENT
 #define SKSL_STATEMENT
 
 #include "SkSLIRNode.h"
 #include "SkSLType.h"
 
 namespace SkSL {
 
 /**
  * Abstract supertype of all statements.
  */
 struct Statement : public IRNode {
     enum Kind {
         kBlock_Kind,
         kBreak_Kind,
         kContinue_Kind,
         kDiscard_Kind,
         kDo_Kind,
         kExpression_Kind,
         kFor_Kind,
         kIf_Kind,
         kReturn_Kind,
-        kVarDeclaration_Kind,
+        kVarDeclarations_Kind,
         kWhile_Kind
     };
 
     Statement(Position position, Kind kind)
     : INHERITED(position)
     , fKind(kind) {}
 
     const Kind fKind;
 
     typedef IRNode INHERITED;
 };
 
 } // namespace
 
 #endif