Add exports needed for glue to build as a component.

webkit/plugins/npapi/plugin_constants_win.h

Index: webkit/plugins/npapi/plugin_constants_win.h
diff --git a/webkit/plugins/npapi/plugin_constants_win.h b/webkit/plugins/npapi/plugin_constants_win.h
index edfbaaf70b9b91595c0f1c831d5509008abe0c68..2ef80feedafc36974d4d1ba3bae55feb9121223c 100644
--- a/webkit/plugins/npapi/plugin_constants_win.h
+++ b/webkit/plugins/npapi/plugin_constants_win.h
@@ -6,6 +6,7 @@
 #define WEBKIT_PLUGINS_NPAPI_PLUGIN_CONSTANTS_WIN_H_
 
 #include "base/string16.h"
+#include "webkit/plugins/webkit_plugins_export.h"
 
 namespace webkit {
 namespace npapi {
@@ -14,22 +15,22 @@ namespace npapi {
 extern const char16 kNativeWindowClassName[];
 
 // If property is non-zero window reparenting must add UIPI message filters.
-extern const char16 kNativeWindowClassFilterProp[];
+WEBKIT_PLUGINS_EXPORT extern const char16 kNativeWindowClassFilterProp[];
 
 // The name of the window class name for the wrapper HWND around the actual
 // plugin window that's used when running in multi-process mode.  This window
 // is created on the browser UI thread.
-extern const char16 kWrapperNativeWindowClassName[];
+WEBKIT_PLUGINS_EXPORT extern const char16 kWrapperNativeWindowClassName[];
 
 // The name of the custom window message that the browser uses to tell the
 // plugin process to paint a window.
-extern const char16 kPaintMessageName[];
+WEBKIT_PLUGINS_EXPORT extern const char16 kPaintMessageName[];
 
 // The name of the registry key which NPAPI plugins update on installation.
-extern const char16 kRegistryMozillaPlugins[];
+WEBKIT_PLUGINS_EXPORT extern const char16 kRegistryMozillaPlugins[];
 
 extern const char16 kMozillaActiveXPlugin[];
-extern const char16 kNewWMPPlugin[];
+WEBKIT_PLUGINS_EXPORT extern const char16 kNewWMPPlugin[];
 extern const char16 kOldWMPPlugin[];
 extern const char16 kYahooApplicationStatePlugin[];
 extern const char16 kWanWangProtocolHandlerPlugin[];