Replace RE2 import with a dependency

third_party/re2/re2.gyp

Index: third_party/re2/re2.gyp
diff --git a/third_party/re2/re2.gyp b/third_party/re2/re2.gyp
index e66504d7a493184ddbc331c84846887888bd70cf..49b4fc17faea47a74f44da7d1b745d0423371c44 100644
--- a/third_party/re2/re2.gyp
+++ b/third_party/re2/re2.gyp
@@ -11,12 +11,12 @@
       'target_name': 're2',
       'type': 'static_library',
       'include_dirs': [
-        '.',
+        'src',
         '<(DEPTH)',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
-          '.',
+          'src',
           '<(DEPTH)',
         ],
       },
@@ -24,53 +24,53 @@
         '<(DEPTH)/base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
       ],
       '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',
       ],
       'conditions': [
         ['OS=="win"', {