[AppRemoting] Reduce usage of webkit prefix

remoting/webapp/crd/html/toolbar.css

Index: remoting/webapp/crd/html/toolbar.css
diff --git a/remoting/webapp/crd/html/toolbar.css b/remoting/webapp/crd/html/toolbar.css
index ea83c298dfc37668b60ec4c39b5fec5fb727795e..ee4371746c48f3b736422cacd7d81f782df6f2a9 100644
--- a/remoting/webapp/crd/html/toolbar.css
+++ b/remoting/webapp/crd/html/toolbar.css
@@ -7,7 +7,7 @@
   position: fixed;
   top: -48px;
   width: 640px;
-  -webkit-transition: top 0.15s ease;
+  transition: top 0.15s ease;
   font-size: 13px;
   pointer-events: none;
   z-index: 1;
@@ -28,7 +28,7 @@
   box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
   pointer-events: all;
   clip: rect(0, 999px, 999px, -999px);
-  -webkit-transition: height 0.15s ease;
+  transition: height 0.15s ease;
 }
 
 .toolbar-stub-extended,
@@ -76,7 +76,7 @@
   left: 62px;
   bottom: 2px;
   opacity: 0.5;
-  -webkit-transition: bottom 0.15s ease, opacity 0.1s linear;
+  transition: bottom 0.15s ease, opacity 0.1s linear;
 }
 
 .toolbar-stub-extended .arrow-down,
@@ -90,5 +90,5 @@
 }
 
 .toolbar-visible .arrow-down {
-  -webkit-transform: rotate(180deg);
+  transform: rotate(180deg);
 }