[Media Router WebUI] Fix AX_COLOR_01 warnings.

chrome/browser/resources/media_router/elements/media_router_container/media_router_container.css

Index: chrome/browser/resources/media_router/elements/media_router_container/media_router_container.css
diff --git a/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.css b/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.css
index abcb061e1d56b40a9630a095a89cb531d7b15629..426386ed7c6b14a1bfe33ce079f0c39291495f1b 100644
--- a/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.css
+++ b/chrome/browser/resources/media_router/elements/media_router_container/media_router_container.css
@@ -34,7 +34,7 @@
 }
 
 #device-missing a {
-  color: rgba(33, 150, 243, 0.87);
+  color: rgb(25, 118, 210);
   margin: 8px 0;
   text-decoration: none;
 }
@@ -105,7 +105,7 @@
 }
 
 #no-search-matches {
-  color: rgb(150, 150, 150);
+  color: rgb(112, 112, 112);
   display: block;
   font-size: 1.2 em;
   padding-bottom: 20px;