[turbolizer] Improved display of perf profiling information.

tools/turbolizer/turbo-visualizer.css

 .visible-transition {
     transition-delay: 0s;
     transition-duration: 1s;
     transition-property: all;
     transition-timing-function: ease;
 }
 
 .collapse-pane {
     background: #A0A0A0;
     bottom: 0;
@@ skipping 308 matching lines @@
 #load-file input {
     background: #A0A0A0;
     border-radius: 5px;
     padding: 0.5em;
 }
 
 #hidden-file-upload {
     display: none;
 }
 
-.prof-low {
-    color: #888;
-}
-
-.prof-med {
-    color: #080;
-}
-
-.prof-high {
-    color: #800;
+.prof {
+    cursor: default;
 }
 
 tspan {
     font-size: 500%;
     font-family: sans-serif;
 }
 
 text {
     dominant-baseline: text-before-edge;
 }