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This way the two different modes can share code and have
all the same behaviors (i.e. context menu options).

AndroidManifest.xml
Remove BookmarkGridPage, which is no longer an Activity.

bookmarks.xml
Add a menu option to switch between the different viewing modes.

strings.xml
Name for that menu option.

AddNewBookmark.java
Remove copyTo, which is not necessary.

BookmarkGridPage.java
Change to just be a GridView, with our desired settings, and
overriding onSizeChanged to size the thumbs appropriately.  Now its
constructor takes a BrowserBookmarksAdapter, which it uses instead
of its old private Adapter.

BrowserBookmarksAdapter.java
Now has two modes, so it can be used for both the bookmarks grid
and the list view.  Removed a bunch of obsolete code, which was
used for searching/sorting the bookmarks.

BrowserBookmarksPage.java
Now switches back and forth between using a GridView and a ListView.