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

chrome/renderer/plugins/plugin_uma.cc

Index: chrome/renderer/plugins/plugin_uma.cc
diff --git a/chrome/renderer/plugins/plugin_uma.cc b/chrome/renderer/plugins/plugin_uma.cc
index ff3ccd741295b554c48769874378caaa99e89110..0aceead0d76a1286e9ed80c60c35aafa1e331766 100644
--- a/chrome/renderer/plugins/plugin_uma.cc
+++ b/chrome/renderer/plugins/plugin_uma.cc
@@ -66,12 +66,6 @@ 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,