Move allocate instance id to chrome/.

chrome/browser/extensions/api/webview/webview_api.cc

Index: chrome/browser/extensions/api/webview/webview_api.cc
diff --git a/chrome/browser/extensions/api/webview/webview_api.cc b/chrome/browser/extensions/api/webview/webview_api.cc
index cfa2e34e948dbba6db75d3766a594f6bbe501409..1f1f626b0e0fd45d82327b9f016e90257c1f9b70 100644
--- a/chrome/browser/extensions/api/webview/webview_api.cc
+++ b/chrome/browser/extensions/api/webview/webview_api.cc
@@ -89,6 +89,15 @@ bool WebviewContextMenusCreateFunction::RunAsync() {
   return success;
 }
 
+bool WebviewNavigateFunction::RunAsyncSafe(WebViewGuest* guest) {
+  scoped_ptr<webview::Navigate::Params> params(
+      webview::Navigate::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+  std::string src = params->src;
+  guest->NavigateGuest(src);
+  return true;
+}
+
 bool WebviewContextMenusUpdateFunction::RunAsync() {
   scoped_ptr<webview::ContextMenusUpdate::Params> params(
       webview::ContextMenusUpdate::Params::Create(*args_));