Revert of Update re2

third_party/re2/re2/prefilter.cc

Index: third_party/re2/re2/prefilter.cc
diff --git a/third_party/re2/re2/prefilter.cc b/third_party/re2/re2/prefilter.cc
index 45e43c9c095a251993f7eaa95ca242e007fefb5e..77e0cbd0968ae8badd78a2c658eed5e0a4bb3e4a 100644
--- a/third_party/re2/re2/prefilter.cc
+++ b/third_party/re2/re2/prefilter.cc
@@ -15,7 +15,6 @@
 typedef set<string>::iterator SSIter;
 typedef set<string>::const_iterator ConstSSIter;
 
-GLOBAL_MUTEX(alloc_id_mutex);
 static int alloc_id = 100000;  // Used for debugging.
 // Initializes a Prefilter, allocating subs_ as necessary.
 Prefilter::Prefilter(Op op) {
@@ -24,9 +23,7 @@
   if (op_ == AND || op_ == OR)
     subs_ = new vector<Prefilter*>;
 
-  GLOBAL_MUTEX_LOCK(alloc_id_mutex);
   alloc_id_ = alloc_id++;
-  GLOBAL_MUTEX_UNLOCK(alloc_id_mutex);
   VLOG(10) << "alloc_id: " << alloc_id_;
 }
 
@@ -34,7 +31,7 @@
 Prefilter::~Prefilter() {
   VLOG(10) << "Deleted: " << alloc_id_;
   if (subs_) {
-    for (size_t i = 0; i < subs_->size(); i++)
+    for (int i = 0; i < subs_->size(); i++)
       delete (*subs_)[i];
     delete subs_;
     subs_ = NULL;
@@ -103,7 +100,7 @@
 
   // If a and b match op, merge their contents.
   if (a->op() == op && b->op() == op) {
-    for (size_t i = 0; i < b->subs()->size(); i++) {
+    for (int i = 0; i < b->subs()->size(); i++) {
       Prefilter* bb = (*b->subs())[i];
       a->subs()->push_back(bb);
     }
@@ -178,7 +175,7 @@
     return r;
   }
 
-  const CaseFold *f = LookupCaseFold(unicode_tolower, num_unicode_tolower, r);
+  CaseFold *f = LookupCaseFold(unicode_tolower, num_unicode_tolower, r);
   if (f == NULL || r < f->lo)
     return r;
   return ApplyFold(f, r);
@@ -495,7 +492,7 @@
   bool latin1() { return latin1_; }
  private:
   bool latin1_;
-  DISALLOW_COPY_AND_ASSIGN(Walker);
+  DISALLOW_EVIL_CONSTRUCTORS(Walker);
 };
 
 Prefilter::Info* Prefilter::BuildInfo(Regexp* re) {
@@ -503,7 +500,7 @@
     LOG(INFO) << "BuildPrefilter::Info: " << re->ToString();
   }
 
-  bool latin1 = (re->parse_flags() & Regexp::Latin1) != 0;
+  bool latin1 = re->parse_flags() & Regexp::Latin1;
   Prefilter::Info::Walker w(latin1);
   Prefilter::Info* info = w.WalkExponential(re, NULL, 100000);
 
@@ -672,7 +669,7 @@
       return "";
     case AND: {
       string s = "";
-      for (size_t i = 0; i < subs_->size(); i++) {
+      for (int i = 0; i < subs_->size(); i++) {
         if (i > 0)
           s += " ";
         Prefilter* sub = (*subs_)[i];
@@ -682,7 +679,7 @@
     }
     case OR: {
       string s = "(";
-      for (size_t i = 0; i < subs_->size(); i++) {
+      for (int i = 0; i < subs_->size(); i++) {
         if (i > 0)
           s += "|";
         Prefilter* sub = (*subs_)[i];