Update re2

third_party/re2/re2/stringpiece.h

Index: third_party/re2/re2/stringpiece.h
diff --git a/third_party/re2/re2/stringpiece.h b/third_party/re2/re2/stringpiece.h
index 38a515097be43078bc21af8f40a1bf0e8eb3d41c..1479d1ac6137d13396507fa2c9bd768b2a79af96 100644
--- a/third_party/re2/re2/stringpiece.h
+++ b/third_party/re2/re2/stringpiece.h
@@ -20,12 +20,10 @@
 #define STRINGS_STRINGPIECE_H__
 
 #include <string.h>
+#include <algorithm>
 #include <cstddef>
 #include <iosfwd>
 #include <string>
-#ifdef WIN32
-#include <algorithm>
-#endif
 
 namespace re2 {
 
@@ -139,15 +137,17 @@ class StringPiece {
   int max_size() const { return length_; }
   int capacity() const { return length_; }
 
-  int copy(char* buf, size_type n, size_type pos = 0) const;
+  size_type copy(char* buf, size_type n, size_type pos = 0) const;
 
-  int find(const StringPiece& s, size_type pos = 0) const;
-  int find(char c, size_type pos = 0) const;
-  int rfind(const StringPiece& s, size_type pos = npos) const;
-  int rfind(char c, size_type pos = npos) const;
+  bool contains(StringPiece s) const;
+
+  size_type find(const StringPiece& s, size_type pos = 0) const;
+  size_type find(char c, size_type pos = 0) const;
+  size_type rfind(const StringPiece& s, size_type pos = npos) const;
+  size_type rfind(char c, size_type pos = npos) const;
 
   StringPiece substr(size_type pos, size_type n = npos) const;
-  
+
   static bool _equal(const StringPiece&, const StringPiece&);
 };