Remove `_RoleButton.pcss` (#10958)

* Remove obsolete style rules

These have been obsolete since 3c5c2bef6d.

* Remove _RoleButton.pcss

mx_RoleButton_tooltip style rules are used only on NotificationBadge.tsx.

* Rename the class

res/css/_components.pcss

@@ -196,7 +196,6 @@
 @import "./views/elements/_ReplyChain.pcss";
 @import "./views/elements/_ResizeHandle.pcss";
 @import "./views/elements/_RichText.pcss";
-@import "./views/elements/_RoleButton.pcss";
 @import "./views/elements/_RoomAliasField.pcss";
 @import "./views/elements/_SSOButtons.pcss";
 @import "./views/elements/_SearchWarning.pcss";

res/css/views/elements/_RoleButton.pcss

@@ -1,33 +0,0 @@
-/*
-Copyright 2017 Vector Creations Ltd
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-.mx_RoleButton {
-    margin-left: 4px;
-    margin-right: 4px;
-    cursor: pointer;
-    display: inline-block;
-}
-
-.mx_RoleButton object {
-    pointer-events: none;
-}
-
-.mx_RoleButton_tooltip {
-    display: inline-block;
-    position: relative;
-    top: -25px;
-    left: 6px;
-}

res/css/views/rooms/_NotificationBadge.pcss

@@ -69,3 +69,10 @@ limitations under the License.
         }
     }
 }
+
+.mx_NotificationBadge_tooltip {
+    display: inline-block;
+    position: relative;
+    top: -25px;
+    left: 6px;
+}

src/components/views/rooms/NotificationBadge.tsx

@@ -123,7 +123,7 @@ export default class NotificationBadge extends React.PureComponent<XOR<IProps, I
         let tooltip: JSX.Element | undefined;
         if (showUnsentTooltip && this.state.showTooltip && notification.color === NotificationColor.Unsent) {
             label = _t("Message didn't send. Click for info.");
-            tooltip = <Tooltip className="mx_RoleButton_tooltip" label={label} />;
+            tooltip = <Tooltip className="mx_NotificationBadge_tooltip" label={label} />;
         }
 
         return (