Revert "Switch to the new SkSL lexer."

This reverts commit c576e93d174f3106e072a2f506bca3990b541265.

Reason for revert: ASAN failures

Original change's description:
> Switch to the new SkSL lexer.
> 
> This completely replaces flex with a new in-house lexical analyzer generator,
> which we have done for performance and memory usage reasons. Flex requires us
> to copy strings every time we need the text of a token, whereas this new lexer
> allows us to handle strings as a (non-null-terminated) pointer and length
> everywhere, eliminating most string copies.
> 
> Bug: skia:
> Change-Id: I2add26efc9e20cb699520e82abcf713af3968aca
> Reviewed-on: https://skia-review.googlesource.com/39780
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

TBR=bsalomon@google.com,ethannicholas@google.com

Change-Id: If27b750a5f696d06a6bcffed12fe9f0598e084a6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/44881
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/src/sksl/ast/SkSLASTFunction.h b/src/sksl/ast/SkSLASTFunction.h
index 4fa2482d8b..36d8a3af9f 100644
--- a/src/sksl/ast/SkSLASTFunction.h
+++ b/src/sksl/ast/SkSLASTFunction.h
@@ -19,13 +19,13 @@ namespace SkSL {
  * A function declaration or definition. The fBody field will be null for declarations.
  */
 struct ASTFunction : public ASTDeclaration {
-    ASTFunction(int offset, Modifiers modifiers,  std::unique_ptr<ASTType> returnType,
-                StringFragment name, std::vector<std::unique_ptr<ASTParameter>> parameters,
+    ASTFunction(Position position, Modifiers modifiers,  std::unique_ptr<ASTType> returnType,
+                String name, std::vector<std::unique_ptr<ASTParameter>> parameters,
                 std::unique_ptr<ASTBlock> body)
-    : INHERITED(offset, kFunction_Kind)
+    : INHERITED(position, kFunction_Kind)
     , fModifiers(modifiers)
     , fReturnType(std::move(returnType))
-    , fName(name)
+    , fName(std::move(name))
     , fParameters(std::move(parameters))
     , fBody(std::move(body)) {}
 
@@ -47,7 +47,7 @@ struct ASTFunction : public ASTDeclaration {
 
     const Modifiers fModifiers;
     const std::unique_ptr<ASTType> fReturnType;
-    const StringFragment fName;
+    const String fName;
     const std::vector<std::unique_ptr<ASTParameter>> fParameters;
     const std::unique_ptr<ASTBlock> fBody;