Revert "Fix activity leak on Android Q"

This reverts commit 4895180009.

October has arrived.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/build.gradle

@@ -71,7 +71,6 @@ ext {
     appcompatVersion = '1.1.0'
     cardviewVersion = '1.0.0'
     databindingVersion = '3.5.0'
-    leakCanaryVersion = "2.0-beta-3"
     materialComponentsVersion = '1.0.0'
     jsr305Version = '3.0.2'
     preferenceVersion = '1.1.0'
@@ -95,7 +94,6 @@ dependencies {
     implementation "com.journeyapps:zxing-android-embedded:$zxingEmbeddedVersion"
     implementation "net.sourceforge.streamsupport:android-retrofuture:$streamsupportVersion"
     implementation "net.sourceforge.streamsupport:android-retrostreams:$streamsupportVersion"
-    debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
 }
 
 tasks.withType(JavaCompile) {

app/src/main/java/com/wireguard/android/activity/MainActivity.java

@@ -53,16 +53,7 @@ public class MainActivity extends BaseActivity
             setSelectedTunnel(null);
             return;
         }
-        if (isTaskRoot()) {
-            // @{link TunnelDetailFragment} is in foreground
-            if (backStackEntries == 2) {
-                getSupportFragmentManager().popBackStack();
-            } else if (backStackEntries == 0) {
-                finishAfterTransition();
-            }
-        } else {
-            super.onBackPressed();
-        }
+        super.onBackPressed();
     }
 
     @Override public void onBackStackChanged() {