Removed Polymer from Observatory deps

packages/polymer/lib/src/build/log_injector.css

-/** Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-    for details. All rights reserved. Use of this source code is governed by a
-    BSD-style license that can be found in the LICENSE file. **/
-.build-logs {
-  position: fixed;
-  bottom: 0;
-  right: 0;
-  max-width: 80vw;
-  z-index: 10000;
-  font-family: sans-serif !important;
-}
-.build-logs .log {
-  padding: 0.6em;
-  background: black;
-  color: white;
-  border: solid 1px #666;
-  border-bottom: 0px;
-  text-overflow: ellipsis;
-  overflow-x: hidden;
-}
-.build-logs .fine {
-  color: green;
-}
-.build-logs .info {
-  color: yellow;
-}
-.build-logs .warning {
-  color: orange;
-}
-.build-logs .error {
-  color: red;
-}
-.build-logs .message {
-  white-space: nowrap;
-  cursor: pointer;
-}
-.build-logs .message.expanded {
-  white-space: normal;
-}
-.build-logs .message a {
-  color: #CCF;
-  text-decoration: bold;
-}
-.build-logs .menu {
-  text-align: right;
-}
-.build-logs .menu div {
-  display: inline-block;
-  background: #666;
-  font-weight: bold;
-  cursor: pointer;
-  border: solid 1px black;
-  padding: 0.6em 1em;
-}
-.build-logs .menu div.active {
-  background: black;
-}
-.build-logs .menu div .num {
-  color: white;
-}
-.build-logs .content {
-  max-height: 75vh;
-  font-size: 1em;
-  overflow-y: auto;
-}
-.build-logs .content > div {
-  display: none;
-}
-.build-logs .content > div.active {
-  display: block;
-}
-
-.build-logs .content span.text {
-  padding: 0.4em 0.2em 0.2em 2em;
-  white-space: pre;
-  display: block;
-  font-family: monospace !important;
-}