Revert of Update re2

third_party/re2/README.chromium

Index: third_party/re2/README.chromium
diff --git a/third_party/re2/README.chromium b/third_party/re2/README.chromium
index f7d576d58178e01d9f9444ee1ab97a46aaad1db5..3522d4c85da53eefbde24591383208c1e861511a 100644
--- a/third_party/re2/README.chromium
+++ b/third_party/re2/README.chromium
@@ -1,8 +1,9 @@
 Name: re2 - an efficient, principled regular expression library
 Short Name: re2
 URL: https://github.com/google/re2
-Version: dba3349aba83b5588e85e5ecf2b56c97f2d259b7
-Date: 2015-12-10
+Version: 7f91923f3ad4
+Date: 2012-06-20
+Revision: 100:7f91923f3ad4
 License: BSD 3-Clause
 License File: LICENSE
 Security Critical: yes
@@ -11,11 +12,23 @@
 RE2 is a fast, safe, thread-friendly alternative to backtracking regular
 expression engines like those used in PCRE, Perl, and Python.
 
-To update RE2, execute the following commands from your Chromium checkout:
-$ git clone https://github.com/google/re2 third_party/re2_new
-$ cp third_party/re2/OWNERS third_party/re2/BUILD.gn third_party/re2/re2.gyp \
-third_party/re2/README.chromium third_party/re2/DEPS third_party/re2_new
-$ rm -rf third_party/re2_new/.git
-$ rm -rf third_party/re2
-$ mv third_party/re2_new third_party/re2
-Then update third_party/re2/BUILD.gn and third_party/re2/re2.gyp.
+Local Modifications (to be applied in this order):
+- Remove valgrind specific code that exists in chromium already
+  (patches/remove-valgrind-code.patch)
+- Support for Windows (patches/re2-msvc9-chrome.patch)
+- Support Android (patches/re2-android.patch)
+- Remove static initializers (patches/remove-static-initializers.patch)
+- Support libcxx (patches/re2-libcxx.patch)
+  https://code.google.com/p/re2/issues/detail?id=76
+- Memory optimization for filtered trees
+  (patches/re2-memory-optimization.patch)
+- Prevent unwanted reports from MemorySanitizer. Note: there's an upstream fix
+  for this (https://code.google.com/p/re2/issues/detail?id=77) which is rendered
+  ineffective by patches/remove-valgrind-code.patch
+  (patches/re2-msan.patch)
+- Remove comparisons of this with NULL, merges upstream b92ce81f1e25
+- Let COMPILE_ASSERT use static_assert if available, merges upstream
+  2225f94df8ec
+- Merge upstream cc56ba02d9d2bdafa614ad5ebf564dde287625bb.
+- Suppress more unwanted reports from MemorySanitizer.
+  (patches/sparse-array-valgrind.patch)