Revert of Update re2

third_party/re2/re2/testing/regexp_generator.cc

Index: third_party/re2/re2/testing/regexp_generator.cc
diff --git a/third_party/re2/re2/testing/regexp_generator.cc b/third_party/re2/re2/testing/regexp_generator.cc
index fd085dbfc13b9447d4d43e56f390fd737b550648..cf2db11855f5ab12d3068adb4c3cd900352189a5 100644
--- a/third_party/re2/re2/testing/regexp_generator.cc
+++ b/third_party/re2/re2/testing/regexp_generator.cc
@@ -111,7 +111,7 @@
 
   // Add atoms if there is room.
   if (atoms < maxatoms_) {
-    for (size_t i = 0; i < atoms_.size(); i++) {
+    for (int i = 0; i < atoms_.size(); i++) {
       post->push_back(atoms_[i]);
       GeneratePostfix(post, nstk + 1, ops, atoms + 1);
       post->pop_back();
@@ -120,7 +120,7 @@
 
   // Add operators if there are enough arguments.
   if (ops < maxops_) {
-    for (size_t i = 0; i < ops_.size(); i++) {
+    for (int i = 0; i < ops_.size(); i++) {
       const string& fmt = ops_[i];
       int nargs = CountArgs(fmt);
       if (nargs <= nstk) {
@@ -134,7 +134,7 @@
 
 // Generates a random postfix command sequence.
 // Stops and returns true once a single sequence has been generated.
-bool RegexpGenerator::GenerateRandomPostfix(vector<string>* post, int nstk,
+bool RegexpGenerator::GenerateRandomPostfix(vector<string> *post, int nstk,
                                             int ops, int atoms) {
   for (;;) {
     // Stop if we get to a single element, but only sometimes.
@@ -151,7 +151,7 @@
 
     // Add operators if there are enough arguments.
     if (ops < maxops_ && acm_->Uniform(2) == 0) {
-      const string& fmt = ops_[acm_->Uniform(static_cast<int32>(ops_.size()))];
+      const string& fmt = ops_[acm_->Uniform(ops_.size())];
       int nargs = CountArgs(fmt);
       if (nargs <= nstk) {
         post->push_back(fmt);
@@ -165,7 +165,7 @@
 
     // Add atoms if there is room.
     if (atoms < maxatoms_ && acm_->Uniform(2) == 0) {
-      post->push_back(atoms_[acm_->Uniform(static_cast<int32>(atoms_.size()))]);
+      post->push_back(atoms_[acm_->Uniform(atoms_.size())]);
       bool ret = GenerateRandomPostfix(post, nstk + 1, ops, atoms + 1);
       post->pop_back();
       if (ret)
@@ -179,7 +179,7 @@
 // in (?: ) to avoid needing to maintain a precedence table.
 void RegexpGenerator::RunPostfix(const vector<string>& post) {
   stack<string> regexps;
-  for (size_t i = 0; i < post.size(); i++) {
+  for (int i = 0; i < post.size(); i++) {
     switch (CountArgs(post[i])) {
       default:
         LOG(FATAL) << "Bad operator: " << post[i];
@@ -208,7 +208,7 @@
   if (regexps.size() != 1) {
     // Internal error - should never happen.
     printf("Bad regexp program:\n");
-    for (size_t i = 0; i < post.size(); i++) {
+    for (int i = 0; i < post.size(); i++) {
       printf("  %s\n", CEscape(post[i]).c_str());
     }
     printf("Stack after running program:\n");