[android_webview] Don't call super.onMeasure in AwTestContainerView

It shouldn't matter much but the onMeasure method should be overridden
without calling super.

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/531583002

Cr-Commit-Position: refs/heads/master@{#292953}

android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java

@@ -305,7 +305,8 @@ public class AwTestContainerView extends FrameLayout {
     @Override
     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         mAwContents.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+        // This method is intended to be overridden without calling super. Doing so clobbers state
+        // set by mAwContents.onMeasure.
     }
 
     @Override