Plugin Power Saver: Make posters work right when image is 404 Not Found.

chrome/renderer/resources/plugin_placeholders.css

Index: chrome/renderer/resources/plugin_placeholders.css
diff --git a/chrome/renderer/resources/plugin_placeholders.css b/chrome/renderer/resources/plugin_placeholders.css
index 4bd5fd9ec16dacdb2780beb14c5ad5a9658c3ce2..facf57b601cfaa53a03bc422a0b3d6423d7be0e2 100644
--- a/chrome/renderer/resources/plugin_placeholders.css
+++ b/chrome/renderer/resources/plugin_placeholders.css
@@ -2,12 +2,19 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
+html {
+  height: 100%;
+  width: 100%;
+}
+
 body {
   font-family: sans-serif;
   margin: 0;
   overflow: hidden;
   text-align: center;
   -webkit-user-select: none;
+  height: 100%;
+  width: 100%;
 }
 
 h1 {