Fix an unitialized read in a unit test to appease valgrind

webkit/glue/media/buffered_data_source_unittest.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/callback.h"
 #include "base/format_macros.h"
 #include "base/string_util.h"
 #include "media/base/filters.h"
@@ skipping 493 matching lines @@
 
   EXPECT_CALL(*this, ReadCallback(net::ERR_CACHE_MISS));
   ReadLoader(20, 5, buffer);
   StopWhenLoad();
 }
 
 // TODO(hclam): add unit test for defer loading.
 
 class MockBufferedResourceLoader : public BufferedResourceLoader {
  public:
-  MockBufferedResourceLoader() : BufferedResourceLoader() {
+  MockBufferedResourceLoader() : BufferedResourceLoader(NULL, GURL(), 0, 0) {
   }
 
   MOCK_METHOD2(Start, void(net::CompletionCallback* read_callback,
                            NetworkEventCallback* network_callback));
   MOCK_METHOD0(Stop, void());
   MOCK_METHOD4(Read, void(int64 position, int read_size, uint8* buffer,
                           net::CompletionCallback* callback));
   MOCK_METHOD0(content_length, int64());
   MOCK_METHOD0(instance_size, int64());
   MOCK_METHOD0(partial_response, bool());
@@ skipping 400 matching lines @@
   StopDataSource();
 }
 
 TEST_F(BufferedDataSourceTest, FileHasLoadedState) {
   InitializeDataSource(kFileUrl, net::OK, true, 1024, LOADED);
   ReadDataSourceTimesOut(20, 10);
   StopDataSource();
 }
 
 }  // namespace webkit_glue