Bug 1350301 - Fix broken layout of dominator view with callstacks enabled; r=fitzgen

The shared Frame component appears to set the containing element to be a
flex component, while the table view with the dominators expects an
inline-block element. This appears to have been broken for quite
some time with Bug 1251033.

MozReview-Commit-ID: CYkps6QfTJc

--HG--
extra : rebase_source : 4924f1cb0616adc40c9730205b2e5c3a4f9ceee9

devtools/client/themes/memory.css

@@ -483,6 +483,10 @@ html, body, #app, #memory-tool {
   vertical-align: middle;
 }
 
+.heap-tree-item-name .frame-link {
+  display: inline-block;
+}
+
 /**
  * Heap tree view subcolumns
  */