Cache the application context instead of Activity.

When storing a reference to a Context, ensure that it's the
Application context rather than Activity Context.

Bug: 5084293

Change-Id: Ib0be5f8ceb91846bb985d0813a8f22cabd44eaf8
diff --git a/src/com/android/browser/BrowserBookmarksPage.java b/src/com/android/browser/BrowserBookmarksPage.java
index 241eb1d..0c76a70 100644
--- a/src/com/android/browser/BrowserBookmarksPage.java
+++ b/src/com/android/browser/BrowserBookmarksPage.java
@@ -584,7 +584,7 @@
         BookmarkItem mHeader;
 
         public LookupBookmarkCount(Context context, BookmarkItem header) {
-            mContext = context;
+            mContext = context.getApplicationContext();
             mHeader = header;
         }