Revert of Turned on SkSL->GLSL compiler

src/sksl/ast/SkSLASTModifiersDeclaration.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_ASTMODIFIERDECLARATION
-#define SKSL_ASTMODIFIERDECLARATION
-
-#include "SkSLASTDeclaration.h"
-#include "SkSLASTModifiers.h"
-
-namespace SkSL {
-
-/**
- * A declaration that consists only of modifiers, e.g.:
- *
- * layout(blend_support_all_equations) out;
- */
-struct ASTModifiersDeclaration : public ASTDeclaration {
-    ASTModifiersDeclaration(ASTModifiers modifiers)
-    : INHERITED(Position(), kModifiers_Kind)
-    , fModifiers(modifiers) {}
-
-    std::string description() const {
-        return fModifiers.description() + ";";
-    }
-
-    ASTModifiers fModifiers;
-
-    typedef ASTDeclaration INHERITED;
-};
-
-} // namespace
-
-#endif