Removed kAshDisableTextFilteringInOverviewMode flag.

ash/wm/overview/window_selector.cc

Index: ash/wm/overview/window_selector.cc
diff --git a/ash/wm/overview/window_selector.cc b/ash/wm/overview/window_selector.cc
index 0a63e8f8265829e03a8ec472e7d46841ac6a1894..de86abe63cf7c6ab2e284bc32de922cc8e8b0c5d 100644
--- a/ash/wm/overview/window_selector.cc
+++ b/ash/wm/overview/window_selector.cc
@@ -511,11 +511,6 @@ void WindowSelector::OnAttemptToReactivateWindow(aura::Window* request_active,
 
 void WindowSelector::ContentsChanged(views::Textfield* sender,
                                      const base::string16& new_contents) {
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kAshDisableTextFilteringInOverviewMode)) {
-    return;
-  }
-
   text_filter_string_length_ = new_contents.length();
   if (!text_filter_string_length_)
     num_times_textfield_cleared_++;