PDF: Add UMA to track embedded PDF triggered drive-by downloads.

chrome/renderer/plugins/plugin_uma.cc

 // Copyright (c) 2011 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/renderer/plugins/plugin_uma.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/macros.h"
@@ skipping 48 matching lines @@
     default:
       NOTREACHED();
   }
 }
 
 // static.
 PluginUMAReporter* PluginUMAReporter::GetInstance() {
   return base::Singleton<PluginUMAReporter>::get();
 }
 
-// static
-void PluginUMAReporter::ReportPDFLoadStatus(PDFLoadStatus status) {
-  UMA_HISTOGRAM_ENUMERATION("PDF.LoadStatus", status,
-                            PluginUMAReporter::PDF_LOAD_STATUS_COUNT);
-}
-
 void PluginUMAReporter::ReportPluginMissing(const std::string& plugin_mime_type,
                                             const GURL& plugin_src) {
   report_sender_->SendPluginUMA(MISSING_PLUGIN,
                                 GetPluginType(plugin_mime_type, plugin_src));
 }
 
 void PluginUMAReporter::ReportPluginDisabled(
     const std::string& plugin_mime_type,
     const GURL& plugin_src) {
   report_sender_->SendPluginUMA(DISABLED_PLUGIN,
@@ skipping 100 matching lines @@
     return SHOCKWAVE_FLASH;
   }
 
 #if BUILDFLAG(ENABLE_PEPPER_CDMS)
   if (mime_type == kWidevineCdmPluginMimeType)
     return WIDEVINE_CDM;
 #endif
 
   return UNSUPPORTED_MIMETYPE;
 }