Add new IPC for searchbox to pipe SearchBox NavigateContentWindow calls to the browser.

chrome/browser/instant/instant_controller.cc

Index: chrome/browser/instant/instant_controller.cc
diff --git a/chrome/browser/instant/instant_controller.cc b/chrome/browser/instant/instant_controller.cc
index be835bb3703cd3a495288b0474c4388424f5e257..d30decc3f2a2b539c8789096ef378303b05e29e3 100644
--- a/chrome/browser/instant/instant_controller.cc
+++ b/chrome/browser/instant/instant_controller.cc
@@ -792,6 +792,11 @@ void InstantController::InstantLoaderRenderViewGone() {
   CreateDefaultLoader();
 }
 
+void InstantController::NavigateToURL(const GURL& url) {
+  CommitIfPossible(INSTANT_COMMIT_REQUESTED_NAVIGATION);

[samarth, 2012/12/11 04:42:10]

Do we want to commit here?  If a URL suggestion was selected on the instant
overlay, we'd only be showing the "Press [enter] to navigate" message which
doesn't seem to be particularly useful to have in your navigation stack.

The other alternative is to just navigate the current tab, and in the cases
where we were using a loader, just hide it.  What do you think?

[Shishir, 2012/12/11 20:22:39]

Like we discussed, we will keep the committing logic separate which should be
addressed by the user possibly clicking on the page.

+  browser_->OpenURLInCurrentTab(url);
+}
+
 bool InstantController::ResetLoader(const TemplateURL* template_url,
                                     const content::WebContents* active_tab) {
   std::string instant_url;