app_list: Fix blank search results caused by whitespace.

ui/app_list/app_list_view.cc

Index: ui/app_list/app_list_view.cc
diff --git a/ui/app_list/app_list_view.cc b/ui/app_list/app_list_view.cc
index c93adbdbc80c759dad9339b58055caf1b96679cc..e3d823b584f37f7b5143dc7a99f4b709e2a1db70 100644
--- a/ui/app_list/app_list_view.cc
+++ b/ui/app_list/app_list_view.cc
@@ -4,6 +4,7 @@
 
 #include "ui/app_list/app_list_view.h"
 
+#include "base/string_util.h"
 #include "ui/app_list/app_list_bubble_border.h"
 #include "ui/app_list/app_list_item_view.h"
 #include "ui/app_list/app_list_model.h"
@@ -174,7 +175,9 @@ gfx::Rect AppListView::GetBubbleBounds() {
 }
 
 void AppListView::QueryChanged(SearchBoxView* sender) {
-  bool should_show_search = !model_->search_box()->text().empty();
+  string16 query;
+  TrimWhitespace(model_->search_box()->text(), TRIM_ALL, &query);
+  bool should_show_search = !query.empty();
   contents_view_->ShowSearchResults(should_show_search);
 
   if (delegate_.get()) {