✨ Minor cleanup of launching document tabs.

chrome/android/java/src/org/chromium/chrome/browser/document/DocumentUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/document/DocumentUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentUtils.java
index a629b21461cfa7d18ebc3ff5966d20e843b5b462..6bbd9b06b016250b0a19ee55d595f718e4a79261 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/document/DocumentUtils.java
@@ -20,7 +20,6 @@ import android.util.Log;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.chrome.browser.tab.Tab;
-import org.chromium.chrome.browser.tabmodel.document.ActivityDelegate;
 import org.chromium.chrome.browser.tabmodel.document.DocumentTabModelImpl;
 
 import java.util.ArrayList;
@@ -34,38 +33,6 @@ public class DocumentUtils {
     public static final String TAG = "DocumentUtilities";
 
     /**
-     * Finishes tasks other than the one with the given task ID that were started with the given
-     * tabId, leaving a unique task to own a Tab with that particular ID.
-     * @param tabId ID of the tab to remove duplicates for.
-     * @param canonicalTaskId ID of the task will be the only one left with the ID.
-     * @return Intent of one of the tasks that were finished.
-     */
-    public static Intent finishOtherTasksWithTabID(int tabId, int canonicalTaskId) {
-        if (tabId == Tab.INVALID_TAB_ID || Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            return null;
-        }
-
-        Context context = ContextUtils.getApplicationContext();
-
-        ActivityManager manager =
-                (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
-        List<ActivityManager.AppTask> tasksToFinish = new ArrayList<ActivityManager.AppTask>();
-        for (ActivityManager.AppTask task : manager.getAppTasks()) {
-            RecentTaskInfo taskInfo = getTaskInfoFromTask(task);
-            if (taskInfo == null) continue;
-            int taskId = taskInfo.id;
-
-            Intent baseIntent = taskInfo.baseIntent;
-            int otherTabId = ActivityDelegate.getTabIdFromIntent(baseIntent);
-
-            if (otherTabId == tabId && (taskId == -1 || taskId != canonicalTaskId)) {
-                tasksToFinish.add(task);
-            }
-        }
-        return finishAndRemoveTasks(tasksToFinish);
-    }
-
-    /**
      * Finishes tasks other than the one with the given ID that were started with the given data
      * in the Intent, removing those tasks from Recents and leaving a unique task with the data.
      * @param data Passed in as part of the Intent's data when starting the Activity.