WeakPtr destruction order cleanup: media edition.

content/renderer/media/crypto/proxy_decryptor.h

Index: content/renderer/media/crypto/proxy_decryptor.h
diff --git a/content/renderer/media/crypto/proxy_decryptor.h b/content/renderer/media/crypto/proxy_decryptor.h
index 981566624055522a95e170103976719dbde9d730..27d5e574f3f6dc5b825028c17f165724059fe9f4 100644
--- a/content/renderer/media/crypto/proxy_decryptor.h
+++ b/content/renderer/media/crypto/proxy_decryptor.h
@@ -109,8 +109,6 @@ class ProxyDecryptor {
   // stored by copy.
   const std::string& LookupWebSessionId(uint32 session_id) const;
 
-  base::WeakPtrFactory<ProxyDecryptor> weak_ptr_factory_;
-
 #if defined(ENABLE_PEPPER_CDMS)
   // Callback to create the Pepper plugin.
   CreatePepperCdmCB create_pepper_cdm_cb_;
@@ -138,6 +136,10 @@ class ProxyDecryptor {
 
   bool is_clear_key_;
 
+  // NOTE: This must always be last so it's invalidated before other member
+  // variables might be accessed.
+  base::WeakPtrFactory<ProxyDecryptor> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ProxyDecryptor);
 };