[Android] Remove always-true SingleTabActivity#supportsAppSwitcher()

BUG=None

Change-Id: I3acd459cddc8bfdeae25b0f6fa9c99e431fa7f13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884516Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710082}

chrome/android/java/src/org/chromium/chrome/browser/SingleTabActivity.java

@@ -4,11 +4,8 @@
 
 package org.chromium.chrome.browser;
 
-import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.util.Pair;
-import android.view.KeyCharacterMap;
-import android.view.KeyEvent;
 
 import org.chromium.base.ActivityState;
 import org.chromium.base.ApplicationStatus;
@@ -122,11 +119,6 @@ public abstract class SingleTabActivity<C extends ChromeActivityComponent>
      */
     protected abstract TabState restoreTabState(Bundle savedInstanceState, int tabId);
 
-    private boolean supportsAppSwitcher() {
-        return getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN)
-                || KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_APP_SWITCH);
-    }
-
     @Override
     protected boolean handleBackPressed() {
         Tab tab = getActivityTab();
@@ -139,13 +131,6 @@ public abstract class SingleTabActivity<C extends ChromeActivityComponent>
             return true;
         }
 
-        if (!supportsAppSwitcher()) {
-            // If the device has no way to get to the task switcher, we don't want the default back
-            // button behavior of finishing the Activity. If the device is low on memory LMK will
-            // kill us, and if not, we'll start up faster when returned to.
-            moveTaskToBack(true);
-            return true;
-        }
         return false;
     }