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/webidl/moz.build

@@ -285,15 +285,7 @@ WEBIDL_FILES = [
     'MediaDeviceInfo.webidl',
     'MediaDevices.webidl',
     'MediaElementAudioSourceNode.webidl',
-    'MediaEncryptedEvent.webidl',
     'MediaError.webidl',
-    'MediaKeyError.webidl',
-    'MediaKeyMessageEvent.webidl',
-    'MediaKeys.webidl',
-    'MediaKeySession.webidl',
-    'MediaKeysRequestStatus.webidl',
-    'MediaKeyStatusMap.webidl',
-    'MediaKeySystemAccess.webidl',
     'MediaList.webidl',
     'MediaQueryList.webidl',
     'MediaRecorder.webidl',
@@ -565,7 +557,6 @@ WEBIDL_FILES = [
     'WebKitCSSMatrix.webidl',
     'WebSocket.webidl',
     'WheelEvent.webidl',
-    'WidevineCDMManifest.webidl',
     'WifiOptions.webidl',
     'WindowOrWorkerGlobalScope.webidl',
     'WindowRoot.webidl',
@@ -592,6 +583,19 @@ WEBIDL_FILES = [
     'XULElement.webidl',
 ]
 
+if CONFIG['MOZ_EME']:
+    WEBIDL_FILES += [
+        'MediaEncryptedEvent.webidl',
+        'MediaKeyError.webidl',
+        'MediaKeyMessageEvent.webidl',
+        'MediaKeys.webidl',
+        'MediaKeySession.webidl',
+        'MediaKeysRequestStatus.webidl',
+        'MediaKeyStatusMap.webidl',
+        'MediaKeySystemAccess.webidl',
+        'WidevineCDMManifest.webidl',
+    ]
+
 if CONFIG['MOZ_WEBEXTENSIONS']:
   WEBIDL_FILES += ['AddonManager.webidl']