Try to fix a Purify UMR error. This isn't great, but it's better than nothing.

chrome/browser/autocomplete/autocomplete_edit_view_win.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/autocomplete/autocomplete_edit_view_win.h"
 
 #include <locale>
 
 #include "base/base_drag_source.h"
 #include "base/base_drop_target.h"
@@ skipping 1808 matching lines @@
   // scenarios.  This way, all clicks that can move the cursor will place it at
   // the end of the text, but triple-click will still work.
   return is_triple_click ? (right_bound - 1) : right_bound;
 }
 
 void AutocompleteEditViewWin::EmphasizeURLComponents() {
   ITextDocument* const text_object_model = GetTextObjectModel();
   ScopedFreeze freeze(this, text_object_model);
   ScopedSuspendUndo suspend_undo(text_object_model);
 
-  // Save the selection.
-  CHARRANGE saved_sel;
+  // Save the selection.  Bug 8314: Purify started reporting uninitialized
+  // memory access in saved_sel.  This would suggest that GetSelection(), which
+  // is calling the rich edit's GetSel() is failing.  I'm not sure how or why
+  // this would happen.  For now just initialize the CHARRANGE to be safe.
+  CHARRANGE saved_sel = {0, 0};
   GetSelection(saved_sel);
 
   // See whether the contents are a URL with a non-empty host portion, which we
   // should emphasize.  To check for a URL, rather than using the type returned
   // by Parse(), ask the model, which will check the desired page transition for
   // this input.  This can tell us whether an UNKNOWN input string is going to
   // be treated as a search or a navigation, and is the same method the Paste
   // And Go system uses.
   url_parse::Parsed parts;
   AutocompleteInput::Parse(GetText(), model_->GetDesiredTLD(), &parts, NULL);
@@ skipping 334 matching lines @@
 }
 
 void AutocompleteEditViewWin::RepaintDropHighlight(int position) {
   if ((position != -1) && (position <= GetTextLength())) {
     const POINT min_loc(PosFromChar(position));
     const RECT highlight_bounds = {min_loc.x - 1, font_y_adjustment_,
         min_loc.x + 2, font_ascent_ + font_descent_ + font_y_adjustment_};
     InvalidateRect(&highlight_bounds, false);
   }
 }