Convert search_engines_page (and search_engine-adder) to be compatible with Polymer 0.8.

chrome/browser/resources/settings/search_engines_page/search_engine_adder.css

Index: chrome/browser/resources/settings/search_engines_page/search_engine_adder.css
diff --git a/chrome/browser/resources/settings/search_engines_page/search_engine_adder.css b/chrome/browser/resources/settings/search_engines_page/search_engine_adder.css
new file mode 100644
index 0000000000000000000000000000000000000000..b4cb0bb3c50122168fe41fb39b1e330f3621d0bc
--- /dev/null
+++ b/chrome/browser/resources/settings/search_engines_page/search_engine_adder.css
@@ -0,0 +1,20 @@
+/* Copyright (c) 2015 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+.input-label {
+  font-size: 0.75em;
+}
+
+.container {
+  margin-top: 14px;
+  width: 660px;
+}
+
+.add-label {
+  width: 660px;
+}
+
+.input-field {
+  -webkit-margin-end: 20px;
+}