Make search engine dialog not resize while editing

BUG=116441
TEST=dialog doesn't resize itself

Review URL: https://chromiumcodereview.appspot.com/9566039

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124582 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/options2/search_engine_manager.css

@@ -3,7 +3,12 @@
  * found in the LICENSE file. */
 
 #search-engine-manager-page {
-  max-width: 700px;
+  width: 700px;
+}
+
+.search-engine-list input {
+  -webkit-box-flex: 1;
+  display: -webkit-box;
 }
 
 .search-engine-list > div {