Remove ReactRootView's MeasureSpec assertion

Reviewed By: astreet

Differential Revision: D3811226

fbshipit-source-id: 611e5a2960928c19d93823616d68aa11a9786bf6

Author: ayc1

ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -80,19 +80,7 @@ public ReactRootView(Context context, AttributeSet attrs, int defStyle) {
 
   @Override
   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-    int widthMode = MeasureSpec.getMode(widthMeasureSpec);
-    int heightMode = MeasureSpec.getMode(heightMeasureSpec);
-
-    if (widthMode == MeasureSpec.UNSPECIFIED || heightMode == MeasureSpec.UNSPECIFIED) {
-      throw new IllegalStateException(
-          "The root catalyst view must have a width and height given to it by it's parent view. " +
-          "You can do this by specifying MATCH_PARENT or explicit width and height in the " +
-          "layout. widthMode=" + widthMode + ", heightMode=" + heightMode);
-    }
-
-    setMeasuredDimension(
-        MeasureSpec.getSize(widthMeasureSpec),
-        MeasureSpec.getSize(heightMeasureSpec));
+    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 
     mWasMeasured = true;
     // Check if we were waiting for onMeasure to attach the root view