Fix a potential access violation in the destructor of OmniboxViewWin.

chrome/browser/ui/views/omnibox/omnibox_view_win.cc

Index: chrome/browser/ui/views/omnibox/omnibox_view_win.cc
diff --git a/chrome/browser/ui/views/omnibox/omnibox_view_win.cc b/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
index 1fecea8e197831826fa79f2b8a9ee6da9e60c26f..2d81c0d2748bc2f674bdc8c055e1b08408e68006 100644
--- a/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
+++ b/chrome/browser/ui/views/omnibox/omnibox_view_win.cc
@@ -529,8 +529,10 @@ OmniboxViewWin::OmniboxViewWin(OmniboxEditController* controller,
 OmniboxViewWin::~OmniboxViewWin() {
   // Explicitly release the text object model now that we're done with it, and
   // before we free the library. If the library gets unloaded before this
-  // released, it becomes garbage.
-  text_object_model_->Release();
+  // released, it becomes garbage. Note that since text_object_model_ is lazy
+  // initialized, it may still be null.
+  if (text_object_model_)
+    text_object_model_->Release();
 
   // We balance our reference count and unpatch when the last instance has
   // been destroyed.  This prevents us from relying on the AtExit or static