Adding a Find method to the HeadersIterator class....

net/http/http_util.cc

Index: net/http/http_util.cc
===================================================================
--- net/http/http_util.cc	(revision 29169)
+++ net/http/http_util.cc	(working copy)
@@ -642,6 +642,20 @@
   return false;
 }
 
+bool HttpUtil::HeadersIterator::AdvanceTo(const char* name) {
+  DCHECK(name != NULL);
+  DCHECK_EQ(0, StringToLowerASCII<std::string>(name).compare(name))
+      << "the header name must be in all lower case";
+
+  while (GetNext()) {
+    if (LowerCaseEqualsASCII(name_begin_, name_end_, name)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
 HttpUtil::ValuesIterator::ValuesIterator(
     string::const_iterator values_begin,
     string::const_iterator values_end,