Introduce a delegate to avoid hardcoding "chrome-extension" in net/.

webkit/tools/test_shell/simple_resource_loader_bridge.cc

Index: webkit/tools/test_shell/simple_resource_loader_bridge.cc
diff --git a/webkit/tools/test_shell/simple_resource_loader_bridge.cc b/webkit/tools/test_shell/simple_resource_loader_bridge.cc
index 450cbeea09a607d9d15f16a0d6212b1bc2a678d1..3847ff2f50da0ebee1e89435da1dac2f6829efab 100644
--- a/webkit/tools/test_shell/simple_resource_loader_bridge.cc
+++ b/webkit/tools/test_shell/simple_resource_loader_bridge.cc
@@ -177,6 +177,11 @@ class TestShellNetworkDelegate : public net::NetworkDelegate {
                                const FilePath& path) const OVERRIDE {
     return true;
   }
+  virtual bool OnCanThrottleRequest(
+      const net::URLRequest& request) const OVERRIDE {
+    return false;
+  }
+
 };
 
 TestShellRequestContextParams* g_request_context_params = NULL;