webui: Change slightly how the scale-factor gets parsed from a URL.

chrome/browser/ui/webui/fileicon_source.cc

 // Copyright (c) 2012 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/ui/webui/fileicon_source.h"
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 64 matching lines @@
   if (icon_size)
     *icon_size = IconLoader::NORMAL;
   if (scale_factor)
     *scale_factor = ui::SCALE_FACTOR_NONE;
   base::SplitStringIntoKeyValuePairs(query, '=', '&', &parameters);
   for (std::vector<KVPair>::const_iterator iter = parameters.begin();
        iter != parameters.end(); ++iter) {
     if (icon_size && iter->first == kIconSize)
       *icon_size = SizeStringToIconSize(iter->second);
     else if (scale_factor && iter->first == kScaleFactor)
-      *scale_factor = web_ui_util::ParseScaleFactor(iter->second);
+      web_ui_util::ParseScaleFactor(iter->second, scale_factor);
   }
 }
 
 }  // namespace
 
 FileIconSource::FileIconSource()
     : DataSource(kFileIconPath, MessageLoop::current()) {}
 
 FileIconSource::~FileIconSource() {
   cancelable_consumer_.CancelAllRequests();
@@ skipping 56 matching lines @@
         icon->ToImageSkia()->GetRepresentation(
             details.scale_factor).sk_bitmap(),
         false, &icon_data->data());
 
     SendResponse(details.request_id, icon_data);
   } else {
     // TODO(glen): send a dummy icon.
     SendResponse(details.request_id, NULL);
   }
 }