Update page action manifest parsing to match the new format.

chrome/browser/extensions/extension_file_util.cc

 // Copyright (c) 2009 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/extensions/extension_file_util.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/scoped_temp_dir.h"
@@ skipping 208 matching lines @@
     const Extension::PrivacyBlacklistInfo& blacklist =
         extension->privacy_blacklists()[i];
     if (!file_util::PathExists(blacklist.path)) {
       *error = StringPrintf("Could not load '%s' for privacy blacklist.",
                             WideToUTF8(blacklist.path.ToWStringHack()).c_str());
       return false;
     }
   }
 
   // Validate icon location for page actions.
-  const ExtensionActionMap& page_actions = extension->page_actions();
-  for (ExtensionActionMap::const_iterator i(page_actions.begin());
-       i != page_actions.end(); ++i) {
-    ExtensionAction* page_action = i->second;
+  const ExtensionAction* page_action = extension->page_action();
+  if (page_action) {
     const std::vector<std::string>& icon_paths = page_action->icon_paths();
     for (std::vector<std::string>::const_iterator iter = icon_paths.begin();
          iter != icon_paths.end(); ++iter) {
       if (extension->GetResource(*iter).GetFilePath().empty()) {
         *error = StringPrintf("Could not load icon '%s' for page action.",
                               iter->c_str());
         return false;
       }
     }
   }
@@ skipping 155 matching lines @@
         "Filenames starting with \"_\" are reserved for use by the system.",
         filename.c_str());
       return false;
     }
   }
 
   return true;
 }
 
 }  // extension_file_util