🤝 Remove New Document flag from TWA launch intents.

Launch Intents from TWA notifications were launched with the
FLAG_ACTIVITY_NEW_DOCUMENT flag. This resulted in a new Android Task
being created if the Uri being launched did not match the Uri used
to launch any of the existing Tasks. Since launching a TWA from the
Android Launcher wouldn't include a Uri, this practically meant that
opening a page from the notification would launch a new instance of
the TWA.

Bug: 965435
Change-Id: I0921e147d777a4c6320e17284be432bf9dab868e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621168Reviewed-by: Pavel Shmakov <pshmakov@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662097}

chrome/android/java/src/org/chromium/chrome/browser/browserservices/TrustedWebActivityClient.java

@@ -21,7 +21,6 @@ import android.support.customtabs.trusted.TrustedWebActivityService;
 import android.support.customtabs.trusted.TrustedWebActivityServiceConnectionManager;
 import android.support.customtabs.trusted.TrustedWebActivityServiceWrapper;
 
-import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.ContextUtils;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeFeatureList;
@@ -219,7 +218,6 @@ public class TrustedWebActivityClient {
         intent.setData(Uri.parse(url));
         intent.setAction(Intent.ACTION_VIEW);
         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
-                | ApiCompatibilityUtils.getActivityNewDocumentFlag()
                 | Intent.FLAG_ACTIVITY_CLEAR_TOP);
         intent.setComponent(new ComponentName(twaPackageName, twaActivityName));
         return intent;