Remove 'warning' module from the JS scheduler (facebook#13264)

* Remove 'warning' module from the JS scheduler

**what is the change?:**
See title

**why make this change?:**
Internally the 'warning' module has some dependencies which we want to
avoid pulling in during the very early stages of initial pageload. It is
creating a cyclical dependency.

And we wanted to remove this dependency anyway, because this module
should be kept small and decoupled.

**test plan:**
- Tested the exact same change internally in Facebook.com
- Ran unit tests
- Tried out the fixture

**issue:**
Internal task T31831021

* check for console existence before calling console.error

* Move DEV check into separate block

packages/react-scheduler/src/ReactScheduler.js

@@ -42,7 +42,6 @@ type CallbackConfigType = {|
 export type CallbackIdType = CallbackConfigType;
 
 import {canUseDOM} from 'shared/ExecutionEnvironment';
-import warningWithoutStack from 'shared/warningWithoutStack';
 
 // We capture a local reference to any global, in case it gets polyfilled after
 // this module is initially evaluated.
@@ -123,21 +122,23 @@ if (!canUseDOM) {
     localClearTimeout(timeoutId);
   };
 } else {
-  if (typeof localRequestAnimationFrame !== 'function') {
-    warningWithoutStack(
-      false,
-      "This browser doesn't support requestAnimationFrame. " +
-        'Make sure that you load a ' +
-        'polyfill in older browsers. https://fb.me/react-polyfills',
-    );
-  }
-  if (typeof localCancelAnimationFrame !== 'function') {
-    warningWithoutStack(
-      false,
-      "This browser doesn't support cancelAnimationFrame. " +
-        'Make sure that you load a ' +
-        'polyfill in older browsers. https://fb.me/react-polyfills',
-    );
+  if (__DEV__) {
+    if (typeof console !== 'undefined') {
+      if (typeof localRequestAnimationFrame !== 'function') {
+        console.error(
+          "This browser doesn't support requestAnimationFrame. " +
+            'Make sure that you load a ' +
+            'polyfill in older browsers. https://fb.me/react-polyfills',
+        );
+      }
+      if (typeof localCancelAnimationFrame !== 'function') {
+        console.error(
+          "This browser doesn't support cancelAnimationFrame. " +
+            'Make sure that you load a ' +
+            'polyfill in older browsers. https://fb.me/react-polyfills',
+        );
+      }
+    }
   }
 
   let headOfPendingCallbacksLinkedList: CallbackConfigType | null = null;