Delete some unused code found by -Wunused-function

chrome/browser/ui/pdf/pdf_unsupported_feature.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/pdf/pdf_unsupported_feature.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 346 matching lines @@
 
   OpenUsingReader(tab_contents_, reader_webplugininfo_, NULL);
 }
 
 void PDFUnsupportedFeaturePromptDelegate::Cancel() {
   content::RecordAction(reader_installed_ ?
                         UserMetricsAction("PDF_UseReaderInfoBarCancel") :
                         UserMetricsAction("PDF_InstallReaderInfoBarCancel"));
 }
 
+#if defined(OS_WIN) && defined(ENABLE_PLUGIN_INSTALLATION)
 void GotPluginsCallback(int process_id,
                         int routing_id,
                         const std::vector<webkit::WebPluginInfo>& plugins) {
   WebContents* web_contents =
       tab_util::GetWebContentsByID(process_id, routing_id);
   if (!web_contents)
     return;
 
   TabContents* tab = TabContents::FromWebContents(web_contents);
   if (!tab)
@@ skipping 16 matching lines @@
       return;
     }
     break;
   }
 
   scoped_ptr<OpenPDFInReaderPromptDelegate> prompt(
       new PDFUnsupportedFeaturePromptDelegate(tab, reader, plugin_finder));
   PDFTabHelper* pdf_tab_helper = PDFTabHelper::FromWebContents(web_contents);
   pdf_tab_helper->ShowOpenInReaderPrompt(prompt.Pass());
 }
+#endif  // defined(OS_WIN) && defined(ENABLE_PLUGIN_INSTALLATION)
 
 }  // namespace
 
 void PDFHasUnsupportedFeature(content::WebContents* web_contents) {
 #if defined(OS_WIN) && defined(ENABLE_PLUGIN_INSTALLATION)
   // Only works for Windows for now.  For Mac, we'll have to launch the file
   // externally since Adobe Reader doesn't work inside Chrome.
   PluginService::GetInstance()->GetPlugins(base::Bind(&GotPluginsCallback,
       web_contents->GetRenderProcessHost()->GetID(),
       web_contents->GetRenderViewHost()->GetRoutingID()));
 #endif
 }