Don't mess with omnibox selection on update when the omnibox doesn't have focus.

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

Index: chrome/browser/ui/views/omnibox/omnibox_view_win.cc
===================================================================
--- chrome/browser/ui/views/omnibox/omnibox_view_win.cc	(revision 209724)
+++ chrome/browser/ui/views/omnibox/omnibox_view_win.cc	(working copy)
@@ -646,14 +646,20 @@
     // as they'd intended.
     CHARRANGE sel;
     GetSelection(sel);
-    const bool was_reversed = (sel.cpMin > sel.cpMax);
-    const bool was_select_all = (sel.cpMin != sel.cpMax) &&
-      IsSelectAllForRange(sel);
+    const bool was_select_all = IsSelectAllForRange(sel);
 
     RevertAll();
 
-    if (was_select_all)
-      SelectAll(was_reversed);
+    // Only select all when we have focus.  If we don't have focus, selecting
+    // all is unnecessary since the selection will change on regaining focus,
+    // and can in fact cause artifacts, e.g. if the user is on the NTP and
+    // clicks a link to navigate, causing |was_select_all| to be vacuously true
+    // for the empty omnibox, and we then select all here, leading to the
+    // trailing portion of a long URL being scrolled into view.  We could try
+    // and address cases like this, but it seems better to just not muck with
+    // things when the omnibox isn't focused to begin with.
+    if (was_select_all && model()->has_focus())
+      SelectAll(sel.cpMin > sel.cpMax);
   } else if (changed_security_level) {
     // Only the security style changed, nothing else.  Redraw our text using it.
     EmphasizeURLComponents();