Revert of SkSL performance improvements

src/sksl/ir/SkSLProgram.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_PROGRAM
 #define SKSL_PROGRAM
 
 #include <vector>
 #include <memory>
 
 #include "SkSLProgramElement.h"
-#include "SkSLSymbolTable.h"
 
 namespace SkSL {
 
 /**
  * Represents a fully-digested program, ready for code generation.
  */
 struct Program {
     enum Kind {
         kFragment_Kind,
         kVertex_Kind
     };
 
-    Program(Kind kind, std::vector<std::unique_ptr<ProgramElement>> elements, 
-            std::shared_ptr<SymbolTable> symbols)
+    Program(Kind kind, std::vector<std::unique_ptr<ProgramElement>> elements)
     : fKind(kind) 
-    , fElements(std::move(elements))
-    , fSymbols(symbols) {}
+    , fElements(std::move(elements)) {}
 
     Kind fKind;
 
     std::vector<std::unique_ptr<ProgramElement>> fElements;
-    std::shared_ptr<SymbolTable> fSymbols;
 };
 
 } // namespace
 
 #endif