tools/gdb/gdb_chrome.py: Fix a missed webkit->blink rename

Change-Id: Ib80fa764ccfddd7f1643448c7d529d3fad2d7aeb
Reviewed-on: https://chromium-review.googlesource.com/1255043Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595544}

tools/gdb/gdb_chrome.py

@@ -88,7 +88,7 @@ class StringPrinter(Printer):
 
 class String16Printer(StringPrinter):
     def to_string(self):
-        return webkit.ustring_to_string(self.val['_M_dataplus']['_M_p'])
+        return blink.ustring_to_string(self.val['_M_dataplus']['_M_p'])
 pp_set.add_printer(
     'string16',
     '^string16|std::basic_string<(unsigned short|base::char16).*>$',