Make the net resource interface use StringPiece instead of std::string. This...

net/base/net_module.h

Index: net/base/net_module.h
===================================================================
--- net/base/net_module.h	(revision 5738)
+++ net/base/net_module.h	(working copy)
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/string_piece.h"
 
 namespace net {
 
@@ -20,7 +21,7 @@
 //
 class NetModule {
  public:
-  typedef std::string (*ResourceProvider)(int key);
+  typedef StringPiece (*ResourceProvider)(int key);
 
   // Set the function to call when the net module needs resources
   static void SetResourceProvider(ResourceProvider func);
@@ -28,7 +29,7 @@
   // Call the resource provider (if one exists) to get the specified resource.
   // Returns an empty string if the resource does not exist or if there is no
   // resource provider.
-  static std::string GetResource(int key);
+  static StringPiece GetResource(int key);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(NetModule);