[android_webview] Call super.onMeasure in AwTestContainerView.

This essentially reverts http://crrev.com/531583002. The super
call is necessary for measuring children, however the super call
should also happen before the call th mAwContents.onMeasure to
make sure the right set of measuredDimensions are used.

BUG=None
TEST=AndroidWebViewTest
TBR=boliu@chromium.org

Review URL: https://codereview.chromium.org/536873002

Cr-Commit-Position: refs/heads/master@{#293111}

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

@@ -304,9 +304,8 @@ public boolean dispatchKeyEvent(KeyEvent event) {
 
     @Override
     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
         mAwContents.onMeasure(widthMeasureSpec, heightMeasureSpec);
-        // This method is intended to be overridden without calling super. Doing so clobbers state
-        // set by mAwContents.onMeasure.
     }
 
     @Override