Steps to reproduce the problem:
1. Made an android app with the following activity manifest:  
         <activity
            android:name="com.a.b.c.abcActivity"
            android:allowTaskReparenting="true"
            android:configChanges="keyboardHidden|orientation|keyboard|screenSize"
            android:launchMode="singleTask"
            android:noHistory="true"
            android:theme="@android:style/Theme.NoTitleBar">
            <intent-filter>
                <data android:scheme="abcd-${applicationId}" />
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
            </intent-filter>
        </activity>
2. From within this same activity invoked a chrome custom tab using:  CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder()
                         .setShowTitle(true)
                         .setToolbarColor(getTitleBarBackgroundColor())
                         .setStartAnimations(this, android.R.anim.slide_in_left, android.R.anim.slide_out_right)
                         .setExitAnimations(this, android.R.anim.slide_in_left, android.R.anim.slide_out_right)
                         .build();
                 customTabsIntent.intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                 customTabsIntent.launchUrl(this, Uri.parse(url));
3. open a webpage within the custom tab that attempts to redirect back to the same activity that invoked the custom tab

What is the expected behavior?
The chrome custom tab should close

What went wrong?
 when the web page opened within the custom tab attempts to redirect back to app, the redirect succeeds (as logs are produced) but the custom tab does not close and always remains on top unless closed by the user

Did this work before? No 

Chrome version:   Channel: stable
OS Version: 
Flash Version: