Issue #26 Part 2a: make more EME code conditional.

- Exclude missed MediaKey functions and CDMProxy code.
- Exclude EME APIs frm being built (webidl change)
- Fix tests in --disable-eme state

dom/media/gmp/GMPParent.cpp

@@ -30,8 +30,10 @@ using mozilla::ipc::GeckoChildProcessHost;
 #include "WMFDecoderModule.h"
 #endif
 
+#ifdef MOZ_EME
 #include "mozilla/dom/WidevineCDMManifestBinding.h"
 #include "widevine-adapter/WidevineAdapter.h"
+#endif
 
 namespace mozilla {
 
@@ -654,6 +656,7 @@ GMPParent::ReadGMPMetaData()
     return ReadGMPInfoFile(infoFile);
   }
 
+#ifdef MOZ_EME
   // Maybe this is the Widevine adapted plugin?
   nsCOMPtr<nsIFile> manifestFile;
   rv = mDirectory->Clone(getter_AddRefs(manifestFile));
@@ -662,6 +665,9 @@ GMPParent::ReadGMPMetaData()
   }
   manifestFile->AppendRelativePath(NS_LITERAL_STRING("manifest.json"));
   return ReadChromiumManifestFile(manifestFile);
+#else
+  return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+#endif
 }
 
 RefPtr<GenericPromise>
@@ -767,6 +773,7 @@ GMPParent::ParseChromiumManifest(nsString aJSON)
   LOGD("%s: for '%s'", __FUNCTION__, NS_LossyConvertUTF16toASCII(aJSON).get());
 
   MOZ_ASSERT(NS_IsMainThread());
+#ifdef MOZ_EME
   mozilla::dom::WidevineCDMManifest m;
   if (!m.Init(aJSON)) {
     return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
@@ -801,6 +808,10 @@ GMPParent::ParseChromiumManifest(nsString aJSON)
 #endif
 
   return GenericPromise::CreateAndResolve(true, __func__);
+#else  // !MOZ_EME
+  MOZ_ASSERT_UNREACHABLE("don't call me if EME isn't enabled");
+  return GenericPromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+#endif // !MOZ_EME
 }
 
 bool