net: Append base:: in the StringPrintf calls.

net/base/host_port_pair.cc

Index: net/base/host_port_pair.cc
diff --git a/net/base/host_port_pair.cc b/net/base/host_port_pair.cc
index bb6376525b710d841c5011902a71dbaccae5460f..1c4406f4b7fb3952f4cac0beff25cb910bba36e5 100644
--- a/net/base/host_port_pair.cc
+++ b/net/base/host_port_pair.cc
@@ -3,7 +3,9 @@
 // found in the LICENSE file.
 
 #include "net/base/host_port_pair.h"
+
 #include "base/string_util.h"
+#include "base/stringprintf.h"
 #include "googleurl/src/gurl.h"
 
 namespace net {
@@ -18,14 +20,14 @@ HostPortPair HostPortPair::FromURL(const GURL& url) {
 }
 
 std::string HostPortPair::ToString() const {
-  return StringPrintf("%s:%u", HostForURL().c_str(), port_);
+  return base::StringPrintf("%s:%u", HostForURL().c_str(), port_);
 }
 
 std::string HostPortPair::HostForURL() const {
   // Check to see if the host is an IPv6 address.  If so, added brackets.
   if (host_.find(':') != std::string::npos) {
     DCHECK_NE(host_[0], '[');
-    return StringPrintf("[%s]", host_.c_str());
+    return base::StringPrintf("[%s]", host_.c_str());
   }
 
   return host_;