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, 0 insertions, 34 deletions

diff --git a/gn/run_sksllex.py b/gn/run_sksllex.py
deleted file mode 100644
index 0377283b5a..0000000000
--- a/gn/run_sksllex.py
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2017 Google Inc.
-#
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import os
-import subprocess
-import sys
-
-sksllex = sys.argv[1]
-clangFormat = sys.argv[2]
-src = sys.argv[3]
-try:
-    subprocess.check_output([sksllex, src + "/sksl/lex/sksl.lex", "Lexer",
-                             "Token", src + "/sksl/SkSLLexer.h", src +
-                             "/sksl/SkSLLexer.cpp"])
-    subprocess.check_call(clangFormat + " -i \"" + src + "/sksl/SkSLLexer.h\"",
-                          shell=True)
-    subprocess.check_call(clangFormat + " -i \"" + src +
-                          "/sksl/SkSLLexer.cpp\"", shell=True)
-    subprocess.check_output([sksllex, src + "/sksl/lex/layout.lex",
-                             "LayoutLexer", "LayoutToken",
-                             src + "/sksl/SkSLLayoutLexer.h",
-                             src + "/sksl/SkSLLayoutLexer.cpp"])
-    subprocess.check_call(clangFormat + " -i \"" + src +
-                          "/sksl/SkSLLayoutLexer.h\"", shell=True)
-    subprocess.check_call(clangFormat + " -i \"" + src +
-                          "/sksl/SkSLLayoutLexer.cpp\"", shell=True)
-except subprocess.CalledProcessError as err:
-    print("### Lexer error:")
-    print(err.output)
-    exit(1)