Remove an unnecessary field.

This string was used for logging error messages, but
it is not used.
diff --git a/src/com/android/browser/BrowserBookmarksAdapter.java b/src/com/android/browser/BrowserBookmarksAdapter.java
index 27782e0..09741ae 100644
--- a/src/com/android/browser/BrowserBookmarksAdapter.java
+++ b/src/com/android/browser/BrowserBookmarksAdapter.java
@@ -40,8 +40,6 @@
 
 class BrowserBookmarksAdapter extends BaseAdapter {
 
-    private final String            LOGTAG = "Bookmarks";
-
     private String                  mCurrentPage;
     private Cursor                  mCursor;
     private int                     mCount;