added CTRL+Click and SHIFT+Click handler for context menu, Back and Forward.

chrome/browser/instant/instant_loader.cc

Index: chrome/browser/instant/instant_loader.cc
diff --git a/chrome/browser/instant/instant_loader.cc b/chrome/browser/instant/instant_loader.cc
index 1c7a87473c34ed4081ba30c817572c9852219314..149b48bb175360be7636cf45d94446fe94040757 100644
--- a/chrome/browser/instant/instant_loader.cc
+++ b/chrome/browser/instant/instant_loader.cc
@@ -234,6 +234,12 @@ class InstantLoader::TabContentsDelegateImpl
   virtual void OnStartDownload(DownloadItem* download,
                                TabContentsWrapper* tab) OVERRIDE;
 
+  // Navigation interface to supoprt disposition.
+  virtual void GoBack(WindowOpenDisposition disposition) OVERRIDE;
+  virtual void GoForward(WindowOpenDisposition disposition) OVERRIDE;
+  virtual bool NavigateToIndexWithDisposition(
+      int index, WindowOpenDisposition disp) OVERRIDE;
+
  private:
   typedef std::vector<scoped_refptr<history::HistoryAddPageArgs> >
       AddPageVector;
@@ -591,6 +597,23 @@ void InstantLoader::TabContentsDelegateImpl::OnStartDownload(
   // Downloads are disabled.
 }
 
+void InstantLoader::TabContentsDelegateImpl::GoBack(
+    WindowOpenDisposition disposition) {
+  // Navigations are disabled.
+}
+
+void InstantLoader::TabContentsDelegateImpl::GoForward(
+    WindowOpenDisposition disposition) {
+  // Navigations are disabled.
+}
+
+bool InstantLoader::TabContentsDelegateImpl::NavigateToIndexWithDisposition(
+    int index, WindowOpenDisposition disp) {
+  // Navigations are disabled.
+  return false;
+}
+
+
 void InstantLoader::TabContentsDelegateImpl::OnSetSuggestions(
     int32 page_id,
     const std::vector<std::string>& suggestions,