android: remove ReactContextUtils

In practice, we are never going to be in a position where we don't have a
ReactContext but we do have some React Native code running. So let's not expect
the impossible.

android/sdk/src/main/java/org/jitsi/meet/sdk/ConnectionService.java

             Log.d(TAG, "onDisconnect " + getCallUUID());
             WritableNativeMap data = new WritableNativeMap();
             data.putString("callUUID", getCallUUID());
-            ReactContextUtils.emitEvent(
-                    null,
+            ReactInstanceManagerHolder.emitEvent(
                     "org.jitsi.meet:features/connection_service#disconnect",
                     data);
             // The JavaScript side will not go back to the native with
             Log.d(TAG, "onAbort " + getCallUUID());
             WritableNativeMap data = new WritableNativeMap();
             data.putString("callUUID", getCallUUID());
-            ReactContextUtils.emitEvent(
-                    null,
+            ReactInstanceManagerHolder.emitEvent(
                     "org.jitsi.meet:features/connection_service#abort",
                     data);
             // The JavaScript side will not go back to the native with

android/sdk/src/main/java/org/jitsi/meet/sdk/ReactContextUtils.java

-/*
- * Copyright @ 2017-present Atlassian Pty Ltd
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jitsi.meet.sdk;
-
-import android.support.annotation.Nullable;
-
-import com.facebook.react.bridge.ReactContext;
-import com.facebook.react.modules.core.DeviceEventManagerModule;
-
-public class ReactContextUtils {
-    public static boolean emitEvent(
-            ReactContext reactContext,
-            String eventName,
-            @Nullable Object data) {
-        if (reactContext == null) {
-            // XXX If no ReactContext is specified, emit through the
-            // ReactContext of ReactInstanceManager. ReactInstanceManager
-            // cooperates with ReactContextUtils i.e. ReactInstanceManager will
-            // not invoke ReactContextUtils without a ReactContext.
-            return ReactInstanceManagerHolder.emitEvent(eventName, data);
-        }
-
-        reactContext
-            .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
-            .emit(eventName, data);
-
-        return true;
-    }
-}

android/sdk/src/main/java/org/jitsi/meet/sdk/ReactInstanceManagerHolder.java

 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.common.LifecycleState;
+import com.facebook.react.modules.core.DeviceEventManagerModule;
 
 import java.util.ArrayList;
 import java.util.Arrays;
             ReactContext reactContext
                 = reactInstanceManager.getCurrentReactContext();
 
-            return
-                reactContext != null
-                    && ReactContextUtils.emitEvent(
-                        reactContext,
-                        eventName,
-                        data);
+            if (reactContext != null) {
+                reactContext
+                    .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
+                    .emit(eventName, data);
+
+                return true;
+            }
         }
 
         return false;