Remove older devtools hook

Summary:
As of v1.4.0, a new devtools hook is used that is hosted within `relay-devtools` instead of `relay-runtime`. That allows debugging of production relay apps, and reduces byte size of Relay.

As a result, relay-debugger-react-native-runtime and RelayDebugger can be removed.

Reviewed By: kassens

Differential Revision: D5904296

fbshipit-source-id: 2b215f5a25ecb2922b00cdf86f7d31415d8d1328

Libraries/Core/Devtools/setupDevtools.js

@@ -34,33 +34,28 @@ if (__DEV__) {
    * comment and run Flow. */
   const reactDevTools = require('react-devtools-core');
 
-  register = function (plugin: DevToolsPlugin) {
-    // Initialize dev tools only if the native module for WebSocket is available
-    if (WebSocket.isAvailable) {
-      // Don't steal the DevTools from currently active app.
-      // Note: if you add any AppState subscriptions to this file,
-      // you will also need to guard against `AppState.isAvailable`,
-      // or the code will throw for bundles that don't have it.
-      const isAppActive = () => AppState.currentState !== 'background';
-
-      // Special case: Genymotion is running on a different host.
-      const host = PlatformConstants && PlatformConstants.ServerHost ?
-        PlatformConstants.ServerHost.split(':')[0] :
-        'localhost';
-
-      plugin.connectToDevTools({
-        isAppActive,
-        host,
-        // Read the optional global variable for backward compatibility.
-        // It was added in https://github.com/facebook/react-native/commit/bf2b435322e89d0aeee8792b1c6e04656c2719a0.
-        port: window.__REACT_DEVTOOLS_PORT__,
-        resolveRNStyle: require('flattenStyle'),
-      });
-    }
-  };
-
-  register(reactDevTools);
-  global.registerDevtoolsPlugin = register;
+  // Initialize dev tools only if the native module for WebSocket is available
+  if (WebSocket.isAvailable) {
+    // Don't steal the DevTools from currently active app.
+    // Note: if you add any AppState subscriptions to this file,
+    // you will also need to guard against `AppState.isAvailable`,
+    // or the code will throw for bundles that don't have it.
+    const isAppActive = () => AppState.currentState !== 'background';
+
+    // Special case: Genymotion is running on a different host.
+    const host = PlatformConstants && PlatformConstants.ServerHost ?
+      PlatformConstants.ServerHost.split(':')[0] :
+      'localhost';
+
+    reactDevTools.connectToDevTools({
+      isAppActive,
+      host,
+      // Read the optional global variable for backward compatibility.
+      // It was added in https://github.com/facebook/react-native/commit/bf2b435322e89d0aeee8792b1c6e04656c2719a0.
+      port: window.__REACT_DEVTOOLS_PORT__,
+      resolveRNStyle: require('flattenStyle'),
+    });
+  }
 }
 
 module.exports = {