Ensure the browser does not re-use the current tab by removing the

Browser.EXTRA_APPLICATION_ID Extra instead of adding the newer
EXTRA_CREATE_NEW_TAB extra.

Closes #5397
Fixes #4874
Fixes #5356

src/org/thoughtcrime/securesms/ConversationActivity.java

@@ -33,6 +33,7 @@ import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Vibrator;
+import android.provider.Browser;
 import android.provider.ContactsContract;
 import android.support.annotation.NonNull;
 import android.support.v4.view.WindowCompat;
@@ -368,6 +369,14 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     }
   }
 
+  @Override
+  public void startActivity(Intent intent) {
+    if (intent.getStringExtra(Browser.EXTRA_APPLICATION_ID) != null) {
+      intent.removeExtra(Browser.EXTRA_APPLICATION_ID);
+    }
+    super.startActivity(intent);
+  }
+
   @Override
   public boolean onPrepareOptionsMenu(Menu menu) {
     MenuInflater inflater = this.getMenuInflater();