Revert "Cancel augmented Autofill session when URL bar loses focus"

This reverts commit 444aad95.

Reason for revert: Tests in Canary confirm that the CL does not achieve the intended improvement of Autofill reliability.

Original change's description:
> Cancel augmented Autofill session when URL bar loses focus
>
> Since Android Q, views that are labeled with importantForAutofill=no
> can still trigger the augmented Autofill service. If this happens, no
> ordinary Autofill requests will be triggered anymore for as long as the
> Autofill session remains active. This prevents the user-configured
> Autofill service from running on web contents if the user's first
> interaction is with the URL bar.
>
> This issue is resolved by canceling the current Autofill session when
> the URL bar loses focus.
>
> R=​dmazzoni@chromium.org, michaelbai@chromium.org
>
> Bug: 1103555
> Change-Id: If06c15f4c397107c284c4de757f58c3aeb939cf0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2302636
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#808524}

TBR=dmazzoni@chromium.org,michaelbai@chromium.org,yusufo@chromium.org,agrieve@chromium.org,fabian.henneke@gmail.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1103555
Change-Id: If9fd24b8153256ec8a08d7dd724141e7e338887b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430861
Commit-Queue: Fabian Henneke <fabian.henneke@gmail.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827595}

base/android/java/src/org/chromium/base/compat/ApiHelperForO.java

@@ -11,14 +11,12 @@ import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
 import android.os.Build;
-import android.view.autofill.AutofillManager;
 import android.view.Display;
 import android.view.View;
 import android.view.Window;
 
 import org.chromium.base.StrictModeContext;
 import org.chromium.base.annotations.VerifiesOnO;
-import org.chromium.base.ContextUtils;
 
 /**
  * Utility class to use new APIs that were added in O (API level 26). These need to exist in a
@@ -72,13 +70,4 @@ public final class ApiHelperForO {
             return context.createContextForSplit(name);
         }
     }
-
-    /** See {@link AutofillManager@cancel()}. */
-    public static void cancelAutofillSession() {
-        AutofillManager autofillManager = ContextUtils.getApplicationContext().getSystemService(
-            AutofillManager.class);
-        if (autofillManager != null) {
-            autofillManager.cancel();
-        }
-    }
 }

chrome/android/java/src/org/chromium/chrome/browser/omnibox/UrlBar.java

@@ -39,7 +39,6 @@ import org.chromium.base.Callback;
 import org.chromium.base.Log;
 import org.chromium.base.SysUtils;
 import org.chromium.base.ThreadUtils;
-import org.chromium.base.compat.ApiHelperForO;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.browser.WindowDelegate;
 import org.chromium.ui.KeyboardVisibilityDelegate;
@@ -288,14 +287,6 @@ public abstract class UrlBar extends AutocompleteEditText {
             mPendingScroll = false;
         }
         fixupTextDirection();
-
-        if (!focused && Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
-            // https://crbug.com/1103555: On Android Q+, the URL bar can trigger augmented
-            // Autofill, which disables ordinary Autofill requests for the duration of the
-            // Autofill session. This is worked around by canceling the session when the user
-            // focuses another view.
-            ApiHelperForO.cancelAutofillSession();
-        }
     }
 
     /**