Removed DEV warnings; they didn't follow precedent set by other hooks.

packages/react-reconciler/src/ReactFiberHooks.js

@@ -865,40 +865,8 @@ function useMutableSourceImpl<S>(
   source: MutableSource,
   config: MutableSourceHookConfig<S>,
 ): S {
-  if (__DEV__) {
-    if (typeof config !== 'object' || config === null) {
-      console.error(
-        'Expected useMutableSource() second argument to be a config object. ' +
-          'Instead received: %s.',
-        config === null ? 'null' : typeof config,
-      );
-    }
-  }
-
   const {getSnapshot, getVersion, subscribe} = config;
-  if (__DEV__) {
-    if (
-      typeof getSnapshot !== 'function' ||
-      typeof getVersion !== 'function' ||
-      typeof subscribe !== 'function'
-    ) {
-      console.error(
-        'Invalid useMutableSource() config specified. ' +
-          'Config object should define getSnapshot, getVersion, and subscribe methods. ' +
-          'See https://fb.me/useMutableSource for more information.',
-      );
-    }
-  }
-
   const version = getVersion();
-  if (__DEV__) {
-    if (version == null) {
-      console.error(
-        'useMutableSource() version should not be null or undefined.',
-      );
-    }
-  }
-
   const pendingExpirationTime = getMutableSourcePendingExpirationTime(source);
 
   let isSafeToReadFromSource = false;