Remove the Dromaeo and TodoMVC samples.

samples/third_party/todomvc_performance/web/elements/td_todos.css

-/* base.css overrides */
-
-@host {
-  * {
-    display: block;
-    position: relative;
-  }
-}
-
-button {
-  margin: 0;
-  padding: 0;
-  border: 0;
-  background: none;
-  font-size: 100%;
-  vertical-align: baseline;
-  font-family: inherit;
-  color: inherit;
-  -webkit-appearance: none;
-  /*-moz-appearance: none;*/
-  -ms-appearance: none;
-  -o-appearance: none;
-  appearance: none;
-}
-
-input::-webkit-input-placeholder {
-  font-style: italic;
-}
-
-input::-moz-placeholder {
-  font-style: italic;
-  color: #a9a9a9;
-}
-
-input:-ms-input-placeholder, #new-todo:-ms-input-placeholder {
-  font-style: italic;
-  color: #a9a9a9;
-}
-
-#todoapp {
-  background: #fff;
-  background: rgba(255, 255, 255, 0.9);
-  /*margin: 130px 0 40px 0;*/
-  margin: 0 0 40px 0;
-  border: 1px solid #ccc;
-  position: relative;
-  border-top-left-radius: 2px;
-  border-top-right-radius: 2px;
-  box-shadow: 0 2px 6px 0 rgba(0, 0, 0, 0.2),
-        0 25px 50px 0 rgba(0, 0, 0, 0.15);
-}
-
-#todoapp:before {
-  content: '';
-  border-left: 1px solid #f5d6d6;
-  border-right: 1px solid #f5d6d6;
-  width: 2px;
-  position: absolute;
-  top: 0;
-  left: 40px;
-  height: 100%;
-}
-
-#header {
-  padding-top: 15px;
-  border-radius: inherit;
-}
-
-#header:before {
-  content: '';
-  position: absolute;
-  top: 0;
-  right: 0;
-  left: 0;
-  height: 15px;
-  z-index: 2;
-  border-bottom: 1px solid #6c615c;
-  background: #8d7d77;
-  background: -webkit-gradient(linear, left top, left bottom, from(rgba(132, 110, 100, 0.8)),to(rgba(101, 84, 76, 0.8)));
-  background: -webkit-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
-  background: -moz-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
-  background: -o-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
-  background: -ms-linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
-  background: linear-gradient(top, rgba(132, 110, 100, 0.8), rgba(101, 84, 76, 0.8));
-  filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,StartColorStr='#9d8b83', EndColorStr='#847670');
-  border-top-left-radius: 1px;
-  border-top-right-radius: 1px;
-}
-
-#new-todo,
-.edit {
-  position: relative;
-  margin: 0;
-  width: 100%;
-  font-size: 24px;
-  font-family: inherit;
-  line-height: 1.4em;
-  border: 0;
-  outline: none;
-  color: inherit;
-  padding: 6px;
-  border: 1px solid #999;
-  box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
-  -webkit-box-sizing: border-box;
-  -moz-box-sizing: border-box;
-  -ms-box-sizing: border-box;
-  -o-box-sizing: border-box;
-  box-sizing: border-box;
-  -webkit-font-smoothing: antialiased;
-  -moz-font-smoothing: antialiased;
-  -ms-font-smoothing: antialiased;
-  -o-font-smoothing: antialiased;
-  /* font-smoothing: antialiased; */
-}
-
-#new-todo {
-  padding: 16px 16px 16px 60px;
-  border: none;
-  background: rgba(0, 0, 0, 0.02);
-  z-index: 2;
-  box-shadow: none;
-}
-
-#main {
-  position: relative;
-  z-index: 2;
-  border-top: 1px dotted #adadad;
-}
-
-label[for='toggle-all'] {
-  display: none;
-}
-
-#toggle-all {
-  position: absolute;
-  top: -42px;
-  left: -4px;
-  width: 40px;
-  text-align: center;
-  border: none; /* Mobile Safari */
-}
-
-#toggle-all:before {
-  content: '»';
-  font-size: 28px;
-  color: #d9d9d9;
-  padding: 0 25px 7px;
-}
-
-#toggle-all:checked:before {
-  color: #737373;
-}
-
-#todo-list {
-  margin: 0;
-  padding: 0;
-  list-style: none;
-}
-
-#todo-list li {
-  position: relative;
-  font-size: 24px;
-  border-bottom: 1px dotted #ccc;
-}
-
-#todo-list li:last-child {
-  border-bottom: none;
-}
-
-#todo-list li.editing {
-  border-bottom: none;
-  padding: 0;
-}
-
-#footer {
-  color: #777;
-  padding: 0 15px;
-  position: absolute;
-  right: 0;
-  bottom: -31px;
-  left: 0;
-  height: 20px;
-  z-index: 1;
-  text-align: center;
-}
-
-#footer:before {
-  content: '';
-  position: absolute;
-  right: 0;
-  bottom: 31px;
-  left: 0;
-  height: 50px;
-  z-index: -1;
-  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.3),
-        0 6px 0 -3px rgba(255, 255, 255, 0.8),
-        0 7px 1px -3px rgba(0, 0, 0, 0.3),
-        0 43px 0 -6px rgba(255, 255, 255, 0.8),
-        0 44px 2px -6px rgba(0, 0, 0, 0.2);
-}
-
-#todo-count {
-  float: left;
-  text-align: left;
-}
-
-#filters {
-  margin: 0;
-  padding: 0;
-  list-style: none;
-  position: absolute;
-  right: 0;
-  left: 0;
-}
-
-#filters li {
-  display: inline;
-}
-
-#filters li a {
-  color: #83756f;
-  margin: 2px;
-  text-decoration: none;
-}
-
-#filters li.polymer-selected a {
-  font-weight: bold;
-}
-
-#clear-completed {
-  float: right;
-  position: relative;
-  line-height: 20px;
-  text-decoration: none;
-  background: rgba(0, 0, 0, 0.1);
-  font-size: 11px;
-  padding: 0 10px;
-  border-radius: 3px;
-  box-shadow: 0 -1px 0 0 rgba(0, 0, 0, 0.2);
-}
-
-#clear-completed:hover {
-  background: rgba(0, 0, 0, 0.15);
-  box-shadow: 0 -1px 0 0 rgba(0, 0, 0, 0.3);
-}
-
-@media screen and (-webkit-min-device-pixel-ratio:0) {
-  #toggle-all {
-    background: none;
-    /*
-      ShadowDOM Polyfill work around for webkit/blink bug
-      https://code.google.com/p/chromium/issues/detail?id=251510
-    */
-    background-color: transparent;
-  }
-
-  #toggle-all {
-    top: -56px;
-    left: -15px;
-    width: 65px;
-    height: 41px;
-    -webkit-transform: rotate(90deg);
-    transform: rotate(90deg);
-    -webkit-appearance: none;
-    appearance: none;
-  }
-}