Revert of Pull the Activity context from WindowAndroid if possible

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

Index: ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
index 25951fbb66d00b1a0180a57eb9dca6ff14ca06fc..658d0be820dbdaa253e175e23c8a11e75b54bfd4 100644
--- a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
@@ -12,7 +12,6 @@
 import android.app.PendingIntent;
 import android.content.ContentResolver;
 import android.content.Context;
-import android.content.ContextWrapper;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.os.Build;
@@ -126,24 +125,6 @@
     };
 
     /**
-     * Extract the activity if the given Context either is or wraps one.
-     * Only retrieve the base context if the supplied context is a {@link ContextWrapper} but not
-     * an Activity, given that Activity is already a subclass of ContextWrapper.
-     * @param context The context to check.
-     * @return The {@link Activity} that is extracted through the given Context.
-     */
-    public static Activity activityFromContext(Context context) {
-        if (context instanceof Activity) {
-            return ((Activity) context);
-        } else if (context instanceof ContextWrapper) {
-            context = ((ContextWrapper) context).getBaseContext();
-            return activityFromContext(context);
-        } else {
-            return null;
-        }
-    }
-
-    /**
      * @return true if onVSync handler is executing.
      *
      * @see org.chromium.ui.VSyncMonitor#isInsideVSync()