A quick fix for Bug 52808....

chrome/browser/host_content_settings_map_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 "chrome/browser/host_content_settings_map.h"
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "chrome/browser/pref_service.h"
@@ skipping 568 matching lines @@
   *CommandLine::ForCurrentProcess() = cl;
 }
 
 TEST_F(HostContentSettingsMapTest, ResourceIdentifierPrefs) {
   // This feature is currently behind a flag.
   CommandLine cl(*CommandLine::ForCurrentProcess());
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableResourceContentSettings);
 
   TestingProfile profile;
-  profile.GetPrefs()->Set(prefs::kContentSettingsPatterns,
-      *base::JSONReader::Read(
+  scoped_ptr<Value> value(base::JSONReader::Read(
       "{\"[*.]example.com\":{\"per_plugin\":{\"someplugin\":2}}}", false));
+  profile.GetPrefs()->Set(prefs::kContentSettingsPatterns, *value);
   HostContentSettingsMap* host_content_settings_map =
       profile.GetHostContentSettingsMap();
 
   GURL host("http://example.com/");
   HostContentSettingsMap::Pattern pattern("[*.]example.com");
   std::string resource1("someplugin");
   std::string resource2("otherplugin");
 
   EXPECT_EQ(CONTENT_SETTING_BLOCK,
             host_content_settings_map->GetContentSetting(
@@ skipping 13 matching lines @@
 
   content_setting_prefs =
       profile.GetPrefs()->GetDictionary(prefs::kContentSettingsPatterns);
   base::JSONWriter::Write(content_setting_prefs, false, &prefs_as_json);
   EXPECT_STREQ("{\"[*.]example.com\":{\"per_plugin\":{\"otherplugin\":2}}}",
                prefs_as_json.c_str());
   *CommandLine::ForCurrentProcess() = cl;
 }
 
 }  // namespace