Update InterceptingResourceHandler tests to use MockResourceLoader.

content/browser/loader/test_resource_handler.h

Index: content/browser/loader/test_resource_handler.h
diff --git a/content/browser/loader/test_resource_handler.h b/content/browser/loader/test_resource_handler.h
index 6269f403b7b45c567eeaab7fc03c5cd2fc83e26d..23316553415639ea01f43857bfc0f0eeb9193f1e 100644
--- a/content/browser/loader/test_resource_handler.h
+++ b/content/browser/loader/test_resource_handler.h
@@ -10,6 +10,7 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "base/run_loop.h"
 #include "content/browser/loader/resource_handler.h"
 #include "net/base/io_buffer.h"
@@ -157,6 +158,9 @@ class TestResourceHandler : public ResourceHandler {
 
   void WaitUntilResponseComplete();
 
+  // Returns a weak pointer to |this|.  Allows testing object lifetime.
+  base::WeakPtr<TestResourceHandler> GetWeakPtr();
+
  private:
   // TODO(mmenke):  Remove these, in favor of final_status_ and body_.
   net::URLRequestStatus* request_status_ptr_;
@@ -208,6 +212,8 @@ class TestResourceHandler : public ResourceHandler {
 
   base::RunLoop response_complete_run_loop_;
 
+  base::WeakPtrFactory<TestResourceHandler> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(TestResourceHandler);
 };