reactHostInterface -> reactHost (#39636)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/39636

rename ReactApplication.reactHostInterface -> ReactApplication.reactHost

changelog: [internal] internal

Reviewed By: cortinico, arushikesarwani94

Differential Revision: D49610674

fbshipit-source-id: 24ddf410cf6aae176f673dc574216a3a12f25767

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactActivityDelegate.java

@@ -88,7 +88,7 @@ public class ReactActivityDelegate {
   }
 
   public ReactHost getReactHost() {
-    return ((ReactApplication) getPlainActivity().getApplication()).getReactHostInterface();
+    return ((ReactApplication) getPlainActivity().getApplication()).getReactHost();
   }
 
   public ReactInstanceManager getReactInstanceManager() {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactApplication.kt

@@ -17,9 +17,9 @@ interface ReactApplication {
   val reactNativeHost: ReactNativeHost
 
   /**
-   * Get the default [ReactHostInterface] for this app. This method will be used by the new
-   * architecture of react native
+   * Get the default [ReactHost] for this app. This method will be used by the new architecture of
+   * react native
    */
-  val reactHostInterface: ReactHost?
+  val reactHost: ReactHost?
     get() = null
 }

packages/rn-tester/android/app/src/main/java/com/facebook/react/uiapp/RNTesterApplication.java

@@ -178,7 +178,7 @@ public class RNTesterApplication extends Application implements ReactApplication
 
   @Override
   @UnstableReactNativeAPI
-  public ReactHost getReactHostInterface() {
+  public ReactHost getReactHost() {
     if (mReactHost == null) {
       // Create an instance of ReactHost to manager the instance of ReactInstance,
       // which is similar to how we use ReactNativeHost to manager instance of ReactInstanceManager