Changes instant so that the newly created tab has a new id. Doing

chrome/browser/tabs/tab_strip_model_unittest.cc

Index: chrome/browser/tabs/tab_strip_model_unittest.cc
diff --git a/chrome/browser/tabs/tab_strip_model_unittest.cc b/chrome/browser/tabs/tab_strip_model_unittest.cc
index b33aaa6a76f9ccda519f1241ee18323f87cb57db..c13b38cd67c904a52b27fd5c2e9597886b8d0d37 100644
--- a/chrome/browser/tabs/tab_strip_model_unittest.cc
+++ b/chrome/browser/tabs/tab_strip_model_unittest.cc
@@ -341,8 +341,10 @@ class MockTabStripModelObserver : public TabStripModelObserver {
                             TabChangeType change_type) {
     states_.push_back(new State(contents, index, CHANGE));
   }
-  virtual void TabReplacedAt(TabContentsWrapper* old_contents,
-                             TabContentsWrapper* new_contents, int index) {
+  virtual void TabReplacedAt(TabStripModel* tab_strip_model,
+                             TabContentsWrapper* old_contents,
+                             TabContentsWrapper* new_contents,
+                             int index) {
     State* s = new State(new_contents, index, REPLACED);
     s ->src_contents = old_contents;
     states_.push_back(s);