Switch gfx::Range to use uint32_t instead of size_t.

ui/app_list/search_result.h

Index: ui/app_list/search_result.h
diff --git a/ui/app_list/search_result.h b/ui/app_list/search_result.h
index a0865479c25afad12fd6a4acc4aa45a6c6d95004..130e30cc249bd8c211669830c587e0bc6a8b2b78 100644
--- a/ui/app_list/search_result.h
+++ b/ui/app_list/search_result.h
@@ -57,8 +57,7 @@ class APP_LIST_EXPORT SearchResult {
 
     Tag(int styles, size_t start, size_t end)
         : styles(styles),
-          range(start, end) {
-    }
+          range(static_cast<uint32_t>(start), static_cast<uint32_t>(end)) {}
 
     int styles;
     gfx::Range range;