Cleanup HTML/CSS bits left after NPAPI plugin removal.

remoting/webapp/base/html/main.css

Index: remoting/webapp/base/html/main.css
diff --git a/remoting/webapp/base/html/main.css b/remoting/webapp/base/html/main.css
index 3545f1e6e7ed79001d5536ae277f15c7c1fed66f..4c5234e3413ec628281a8f6184ed756f3d44b5a9 100644
--- a/remoting/webapp/base/html/main.css
+++ b/remoting/webapp/base/html/main.css
@@ -573,11 +573,6 @@ button {
   color: rgba(0, 0, 0, 0.5);
 }
 
-#daemon-plugin-container {
-  width: 0;
-  height: 0;
-}
-
 .dialog-container {
   position: absolute;
   top: 200px;
@@ -618,11 +613,6 @@ html.apps-v2.scrollable {
 }
 */
 
-#host-plugin-container {
-  width: 0;
-  height: 0;
-}
-
 /* The NAT traversal state is independent of the app mode, and both need
  * to be combined to determine the visibility of the butter bar. We use
  * a style for the former and the 'hidden' property for the latter. */