Update some uses of char16 to use the base:: namespace.

tools/gdb/gdb_chrome.py

 # Copyright (c) 2011 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.
 
 """GDB support for Chrome types.
 
 Add this to your gdb by amending your ~/.gdbinit as follows:
   python
   import sys
   sys.path.insert(0, "/path/to/tools/gdb/")
@@ skipping 42 matching lines @@
 class StringPrinter(Printer):
     def display_hint(self):
         return 'string'
 
 
 class String16Printer(StringPrinter):
     def to_string(self):
         return webkit.ustring_to_string(self.val['_M_dataplus']['_M_p'])
 pp_set.add_printer(
     'string16',
-    '^string16|std::basic_string<(unsigned short|char16|base::char16).*>$',
+    '^string16|std::basic_string<(unsigned short|base::char16).*>$',
     String16Printer);
 
 
 class GURLPrinter(StringPrinter):
     def to_string(self):
         return self.val['spec_']
 pp_set.add_printer('GURL', '^GURL$', GURLPrinter)
 
 
 class FilePathPrinter(StringPrinter):
@@ skipping 214 matching lines @@
         yield ('sudden_termination_allowed_',
                self.val['sudden_termination_allowed_'])
         yield ('ignore_input_events_', self.val['ignore_input_events_'])
         yield ('is_guest_', self.val['is_guest_'])
 pp_set.add_printer('content::RenderProcessHostImpl',
                    '^content::RenderProcessHostImpl$',
                    RenderProcessHostImplPrinter)
 
 
 gdb.printing.register_pretty_printer(gdb, pp_set, replace=_DEBUGGING)