DevTools: migrate EventListenersSidebarPane to shadow

third_party/WebKit/Source/devtools/front_end/sources/eventListenerBreakpoints.css

Index: third_party/WebKit/Source/devtools/front_end/sources/eventListenerBreakpoints.css
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/eventListenerBreakpoints.css b/third_party/WebKit/Source/devtools/front_end/sources/eventListenerBreakpoints.css
index 6162cd53ce206e5932c8c6a451c10ee36ade386a..fe842e2a1f060d094b178b865b972984c38080bd 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/eventListenerBreakpoints.css
+++ b/third_party/WebKit/Source/devtools/front_end/sources/eventListenerBreakpoints.css
@@ -4,6 +4,12 @@
  * found in the LICENSE file.
  */
 
+:host {

[einbinder, 2017/05/25 00:10:42]

Why did this need to move?

[luoe, 2017/05/27 03:07:58]

This style is only used by event listeners sidebar pane.  I think
breakPointsList.css should only have the general rules, breakpoint-hit,
breakpoint-list, etc.

+    margin: 0;
+    padding: 2px 4px;
+    min-height: 18px;
+}
+
 .tree-outline {
     padding: 0;
 }