Rename PromisesPanel to PromisePane.

Source/devtools/front_end/promisesPanel.css

Index: Source/devtools/front_end/promisesPanel.css
diff --git a/Source/devtools/front_end/promisesPanel.css b/Source/devtools/front_end/promisesPanel.css
deleted file mode 100644
index 8fadd0e182319f5a81fcf29b338e3966509be960..0000000000000000000000000000000000000000
--- a/Source/devtools/front_end/promisesPanel.css
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * Copyright 2014 The Chromium Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-.promises .data-grid {
-    flex: 1 1;
-}
-
-.promises .data-grid td {
-    white-space:pre;
-}
-
-.promise-tracker-controls {
-    margin-top: 5px;
-    margin-bottom: 5px;
-}