Do not attempt to load 32-bit NPAPI plugins on 64-bit.

content/common/plugin_list_win.cc

Index: content/common/plugin_list_win.cc
diff --git a/content/common/plugin_list_win.cc b/content/common/plugin_list_win.cc
index dfc17114d20ff6d3293858ed13e0d2999daee099..e7d4b4b904bf5255f0eebfd9ac020f76702340ac 100644
--- a/content/common/plugin_list_win.cc
+++ b/content/common/plugin_list_win.cc
@@ -463,9 +463,13 @@ bool PluginList::ShouldLoadPluginUsingPluginList(
     }
   }
 
-#if !defined(ARCH_CPU_X86_64)
-  // The plugin in question could be a 64 bit plugin which we cannot load.
   base::FilePath plugin_path(info.path);
+#if defined(ARCH_CPU_X86_64)
+  // The plugin in question could be a 32 bit plugin which we cannot load.
+  if (IsValid32BitImage(base::MakeAbsoluteFilePath(plugin_path)))
+    return false;
+#else
+  // The plugin in question could be a 64 bit plugin which we cannot load.
   if (!IsValid32BitImage(base::MakeAbsoluteFilePath(plugin_path)))
     return false;
 #endif