Prevent querying of restricted query values.

chrome/renderer/searchbox/searchbox.cc

Index: chrome/renderer/searchbox/searchbox.cc
diff --git a/chrome/renderer/searchbox/searchbox.cc b/chrome/renderer/searchbox/searchbox.cc
index 83a9bd5fab10b1078c70adcdeb2d287329932411..f5aba951b99190718b1db4cde70941ed937abe45 100644
--- a/chrome/renderer/searchbox/searchbox.cc
+++ b/chrome/renderer/searchbox/searchbox.cc
@@ -23,7 +23,8 @@ SearchBox::SearchBox(content::RenderView* render_view)
       last_results_base_(0),
       is_key_capture_enabled_(false),
       display_instant_results_(false),
-      omnibox_font_size_(0) {
+      omnibox_font_size_(0),
+      last_restricted_id_(0) {
 }
 
 SearchBox::~SearchBox() {
@@ -42,6 +43,10 @@ void SearchBox::SetSuggestions(
       render_view()->GetRoutingID(), render_view()->GetPageId(), suggestions));
 }
 
+void SearchBox::ClearQuery() {
+  query_.clear();
+}
+
 void SearchBox::ShowInstantOverlay(InstantShownReason reason,
                                    int height,
                                    InstantSizeUnits units) {