DevTools: Center breadcrumbs vertically.

NOTRY=true

Change-Id: Id20b6f20182f40659bb7b7e3040dd91e4f700353
Reviewed-on: https://chromium-review.googlesource.com/600928Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491917}

third_party/WebKit/Source/devtools/front_end/elements/breadcrumbs.css

@@ -8,7 +8,6 @@
     display: inline-block;
     pointer-events: auto;
     cursor: default;
-    line-height: 17px;
     white-space: nowrap;
 }
 
@@ -16,6 +15,7 @@
     display: inline-block;
     padding: 0 7px;
     height: 18px;
+    line-height: 18px;
     white-space: nowrap;
 }