Revert of Remove a bunch of NPAPI quirks and related support code

content/common/plugin_constants_win.h

Index: content/common/plugin_constants_win.h
diff --git a/content/common/plugin_constants_win.h b/content/common/plugin_constants_win.h
index 5363868c6cce5686672d722889ab4561871d1d24..815cbf4ab95f8f1d63016bc7a62c0e12723ed6f1 100644
--- a/content/common/plugin_constants_win.h
+++ b/content/common/plugin_constants_win.h
@@ -14,6 +14,8 @@
 
 namespace content {
 
+extern const base::char16 kDummyActivationWindowName[];
+
 // The name of the registry key which NPAPI plugins update on installation.
 extern const base::char16 kRegistryMozillaPlugins[];
 
@@ -22,8 +24,16 @@
 extern const base::char16 kOldWMPPlugin[];
 extern const base::char16 kYahooApplicationStatePlugin[];
 extern const base::char16 kWanWangProtocolHandlerPlugin[];
+extern const base::char16 kFlashPlugin[];
+extern const base::char16 kAcrobatReaderPlugin[];
+extern const base::char16 kRealPlayerPlugin[];
+extern const base::char16 kSilverlightPlugin[];
 extern const base::char16 kJavaPlugin1[];
 extern const base::char16 kJavaPlugin2[];
+
+extern const char kGPUPluginMimeType[];
+
+extern const base::char16 kPluginDummyParentProperty[];
 
 }  // namespace content