Report PPAPI plugin load error code to UMA.

chrome/renderer/chrome_render_process_observer.cc

Index: chrome/renderer/chrome_render_process_observer.cc
diff --git a/chrome/renderer/chrome_render_process_observer.cc b/chrome/renderer/chrome_render_process_observer.cc
index e4f6d4b8390aa9762f3b4451c3c486d674560534..450f1cdf0e142087d63521a076b5f6a6fc9435ea 100644
--- a/chrome/renderer/chrome_render_process_observer.cc
+++ b/chrome/renderer/chrome_render_process_observer.cc
@@ -294,8 +294,7 @@ ChromeRenderProcessObserver::ChromeRenderProcessObserver(
 #elif defined(OS_WIN)
   // crypt32.dll is used to decode X509 certificates for Chromoting.
   // Only load this library when the feature is enabled.
-  std::string error;
-  base::LoadNativeLibrary(base::FilePath(L"crypt32.dll"), &error);
+  base::LoadNativeLibrary(base::FilePath(L"crypt32.dll"), NULL);
 #endif
   // Setup initial set of crash dump data for Field Trials in this renderer.
   chrome_variations::SetChildProcessLoggingVariationList();