Fix script for printing string16 in lldb.

Looks like the underlying ivar names changed.

Change-Id: I78755e0d5a77c19c1b972ff933f0e81b14dbdbe4
Reviewed-on: https://chromium-review.googlesource.com/1013299Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551215}

tools/lldb/lldb_chrome.py

@@ -17,8 +17,8 @@ def __lldb_init_module(debugger, internal_dict):
 
 # This is highly dependent on libc++ being compiled with little endian.
 def basestring16_SummaryProvider(valobj, internal_dict):
-    s = valobj.GetValueForExpressionPath('.__r_.__first_.__s')
-    l = valobj.GetValueForExpressionPath('.__r_.__first_.__l')
+    s = valobj.GetValueForExpressionPath('.__r_.__value_.__s')
+    l = valobj.GetValueForExpressionPath('.__r_.__value_.__l')
     size = s.GetChildMemberWithName('__size_').GetValueAsUnsigned(0)
     is_short_string = size & 1 == 0
     if is_short_string: