Revert of Pull the Activity context from WindowAndroid if possible

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 7147b93cd8a7c16359adb74bbc041835f21d149a..b7bbcf4a397e658a310bdee6820141c556d4b7cd 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -12,6 +12,7 @@
 import android.content.ClipboardManager;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.content.ContextWrapper;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
@@ -430,6 +431,22 @@
      */
     public interface SmartClipDataListener {
         public void onSmartClipDataExtracted(String text, String html, Rect clipRect);
+    }
+
+    /**
+     * Cast from Context to Activity taking ContextWrapper into account.
+     */
+    public static Activity activityFromContext(Context context) {
+        // Only retrieve the base context if the supplied context is a ContextWrapper but not
+        // an Activity, given that Activity is already a subclass of ContextWrapper.
+        if (context instanceof Activity) {
+            return ((Activity) context);
+        } else if (context instanceof ContextWrapper) {
+            context = ((ContextWrapper) context).getBaseContext();
+            return activityFromContext(context);
+        } else {
+            return null;
+        }
     }
 
     private final Context mContext;