Replace RE2 import with a dependency

third_party/re2/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 config("re2_config") {
-  include_dirs = [ "." ]
+  include_dirs = [ "src" ]
 }
 
 static_library("re2") {
   sources = [
-    "re2/bitstate.cc",
-    "re2/compile.cc",
-    "re2/dfa.cc",
-    "re2/filtered_re2.cc",
-    "re2/filtered_re2.h",
-    "re2/mimics_pcre.cc",
-    "re2/nfa.cc",
-    "re2/onepass.cc",
-    "re2/parse.cc",
-    "re2/perl_groups.cc",
-    "re2/prefilter.cc",
-    "re2/prefilter.h",
-    "re2/prefilter_tree.cc",
-    "re2/prefilter_tree.h",
-    "re2/prog.cc",
-    "re2/prog.h",
-    "re2/re2.cc",
-    "re2/re2.h",
-    "re2/regexp.cc",
-    "re2/regexp.h",
-    "re2/set.cc",
-    "re2/set.h",
-    "re2/simplify.cc",
-    "re2/stringpiece.cc",
-    "re2/stringpiece.h",
-    "re2/tostring.cc",
-    "re2/unicode_casefold.cc",
-    "re2/unicode_casefold.h",
-    "re2/unicode_groups.cc",
-    "re2/unicode_groups.h",
-    "re2/variadic_function.h",
-    "re2/walker-inl.h",
-    "util/atomicops.h",
-    "util/flags.h",
-    "util/hash.cc",
-    "util/logging.cc",
-    "util/logging.h",
-    "util/mutex.h",
-    "util/rune.cc",
-    "util/sparse_array.h",
-    "util/sparse_set.h",
-    "util/stringprintf.cc",
-    "util/strutil.cc",
-    "util/utf.h",
-    "util/util.h",
-    "util/valgrind.cc",
-    "util/valgrind.h",
+    "src/re2/bitstate.cc",
+    "src/re2/compile.cc",
+    "src/re2/dfa.cc",
+    "src/re2/filtered_re2.cc",
+    "src/re2/filtered_re2.h",
+    "src/re2/mimics_pcre.cc",
+    "src/re2/nfa.cc",
+    "src/re2/onepass.cc",
+    "src/re2/parse.cc",
+    "src/re2/perl_groups.cc",
+    "src/re2/prefilter.cc",
+    "src/re2/prefilter.h",
+    "src/re2/prefilter_tree.cc",
+    "src/re2/prefilter_tree.h",
+    "src/re2/prog.cc",
+    "src/re2/prog.h",
+    "src/re2/re2.cc",
+    "src/re2/re2.h",
+    "src/re2/regexp.cc",
+    "src/re2/regexp.h",
+    "src/re2/set.cc",
+    "src/re2/set.h",
+    "src/re2/simplify.cc",
+    "src/re2/stringpiece.cc",
+    "src/re2/stringpiece.h",
+    "src/re2/tostring.cc",
+    "src/re2/unicode_casefold.cc",
+    "src/re2/unicode_casefold.h",
+    "src/re2/unicode_groups.cc",
+    "src/re2/unicode_groups.h",
+    "src/re2/variadic_function.h",
+    "src/re2/walker-inl.h",
+    "src/util/atomicops.h",
+    "src/util/flags.h",
+    "src/util/hash.cc",
+    "src/util/logging.cc",
+    "src/util/logging.h",
+    "src/util/mutex.h",
+    "src/util/rune.cc",
+    "src/util/sparse_array.h",
+    "src/util/sparse_set.h",
+    "src/util/stringprintf.cc",
+    "src/util/strutil.cc",
+    "src/util/utf.h",
+    "src/util/util.h",
+    "src/util/valgrind.cc",
+    "src/util/valgrind.h",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   public_configs = [ ":re2_config" ]
 
   deps = [
     "//base/third_party/dynamic_annotations",
   ]
 
   if (is_win) {
     cflags = [
       "/wd4018",  # Signed/unsigned mismatch in comparison.
       "/wd4722",  # Destructor never terminates.
     ]
   }
 
   # TODO(battre) If Dr. Memory is ever migrated to GN, a flag needs to be
   # added for this that adds a MEMORY_SANITIZER define. See re2.gyp.
   # if (is_drmemory) {
   #   defines += [ "MEMORY_SANITIZER" ]
   # }
 }