Fix a crash in the history publisher. This is caused by me changing the...

chrome/browser/history/history_publisher_win.cc

Index: chrome/browser/history/history_publisher_win.cc
===================================================================
--- chrome/browser/history/history_publisher_win.cc	(revision 54815)
+++ chrome/browser/history/history_publisher_win.cc	(working copy)
@@ -120,7 +120,10 @@
   ScopedBstr url(ASCIIToWide(page_data.url.spec()).c_str());
   ScopedBstr html(page_data.html);
   ScopedBstr title(page_data.title);
-  ScopedBstr format(ASCIIToWide(page_data.thumbnail_format).c_str());
+  // Don't send a NULL string through ASCIIToWide.
+  ScopedBstr format(page_data.thumbnail_format ?
+      ASCIIToWide(page_data.thumbnail_format).c_str() :
+      NULL);
   ScopedVariant psa(thumbnail_arr.m_psa);
   for (size_t i = 0; i < indexers_.size(); ++i) {
     indexers_[i]->SendPageData(time, url, html, title, format, psa);