Fix AutocompleteMatch DCHECK() triggered by |RenderViewContextMenu::AppendSearchProvider()|.

chrome/browser/tab_contents/render_view_context_menu.cc

Index: chrome/browser/tab_contents/render_view_context_menu.cc
===================================================================
--- chrome/browser/tab_contents/render_view_context_menu.cc	(revision 108864)
+++ chrome/browser/tab_contents/render_view_context_menu.cc	(working copy)
@@ -4,6 +4,7 @@
 
 #include <algorithm>
 #include <set>
+#include <utility>
 
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 
@@ -398,7 +399,7 @@
     const ExtensionMenuItem::List& items,
     bool can_cross_incognito,
     ui::SimpleMenuModel* menu_model,
-    int *index) {
+    int* index) {
   string16 selection_text = PrintableSelectionText();
   ExtensionMenuItem::Type last_type = ExtensionMenuItem::NORMAL;
   int radio_group_id = 1;
@@ -799,6 +800,9 @@
   if (params_.selection_text.empty())
     return;
 
+  ReplaceChars(params_.selection_text, AutocompleteMatch::kInvalidChars,
+               ASCIIToUTF16(" "), &params_.selection_text);
+
   AutocompleteMatch match;
   profile_->GetAutocompleteClassifier()->Classify(
       params_.selection_text, string16(), false, false, &match, NULL);