Revert following changes for fixing Primetime issue:

- Issue #26 Part 2a: make more EME code conditional. (99118e38e)
- Issue #26 - Part 2b: Stub out GMPDecryptorProxy functions. (d44c61bf6)
- Issue #26 - Part 2c: Remove dependence on gmp/widevine-adapter/* (4c9689f68)
- Issue #1392 - Change --enable-eme to MOZ_ARG_ENABLE_BOOL and remove MOZ_EME_MODULES (832d84d2c)
- [Basilisk] Issue MoonchildProductions/UXP#1392 - Remove usage of MOZ_EME_MODULES (3a165cd)
- Issue #65 - Remove AppConstants from toolkit/mozapps/extensions (758618b60)

dom/media/MediaFormatReader.cpp

@@ -4,10 +4,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#ifdef MOZ_EME
 #include "mozilla/CDMProxy.h"
-#endif
-
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/dom/HTMLMediaElement.h"
 #include "mozilla/Preferences.h"
@@ -614,6 +611,7 @@ private:
   nsTArray<uint8_t> mInitData;
   nsString mInitDataType;
 };
+#endif
 
 void
 MediaFormatReader::SetCDMProxy(CDMProxy* aProxy)
@@ -626,7 +624,6 @@ MediaFormatReader::SetCDMProxy(CDMProxy* aProxy)
   });
   OwnerThread()->Dispatch(r.forget());
 }
-#endif // MOZ_EME
 
 bool
 MediaFormatReader::IsWaitingOnCDMResource() {