history: don't flex device names, takes up too much space.

R=estade@chromium.org
BUG=424052

Review URL: https://codereview.chromium.org/669573002

Cr-Commit-Position: refs/heads/master@{#300287}

chrome/browser/resources/history/other_devices.css

@@ -25,14 +25,6 @@
   margin-top: 8px;
 }
 
-.device-name {
-  flex: 1;
-}
-
-.device button {
-  flex: none;
-}
-
 .device-timestamp {
   color: rgb(151, 156, 160);
   font-size: 12px;