Pepper: Reduce includes in generated thunks.

ppapi/thunk/ppb_content_decryptor_private_thunk.cc

Index: ppapi/thunk/ppb_content_decryptor_private_thunk.cc
diff --git a/ppapi/thunk/ppb_content_decryptor_private_thunk.cc b/ppapi/thunk/ppb_content_decryptor_private_thunk.cc
index 231ef1df861ce82494efa0a29799ce24f69fc805..3af6226c1a7a949f3c55aceabd017e4c22ee87c1 100644
--- a/ppapi/thunk/ppb_content_decryptor_private_thunk.cc
+++ b/ppapi/thunk/ppb_content_decryptor_private_thunk.cc
@@ -3,15 +3,13 @@
 // found in the LICENSE file.
 
 // From private/ppb_content_decryptor_private.idl,
-//   modified Wed Jan  8 16:02:43 2014.
+//   modified Mon Jan 13 12:02:23 2014.
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_content_decryptor_private.h"
 #include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/enter.h"
-#include "ppapi/thunk/ppb_instance_api.h"
-#include "ppapi/thunk/resource_creation_api.h"
-#include "ppapi/thunk/thunk.h"
+#include "ppapi/thunk/ppapi_thunk_export.h"
 
 namespace ppapi {
 namespace thunk {
@@ -162,7 +160,7 @@ const PPB_ContentDecryptor_Private_0_10
 
 }  // namespace
 
-const PPB_ContentDecryptor_Private_0_10*
+PPAPI_THUNK_EXPORT const PPB_ContentDecryptor_Private_0_10*
     GetPPB_ContentDecryptor_Private_0_10_Thunk() {
   return &g_ppb_contentdecryptor_private_thunk_0_10;
 }