Fix license headers in a number of files

third_party/cld/encodings/compact_lang_det/subsetsequence.cc

-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Remember a subset of a sequence of values, using a modest amount of memory
 
 /***
   Design:
   Accumulate in powers of three, using 3-way median to collapse entries.
   At any given time, there is one most-dense (highest power of 3) range of
   entries and a series of less-dense ranges that hold 0..2 entries each. There
@@ skipping 238 matching lines @@
         } else {
           dst[j] = seq_[i];
         }
         ++j;
         err += from_n;
       }
     }
   }
 
 }