Change roots view to "rooted".

Instead of just showing roots in the roots view, show all objects
whose immediate dominator is the SENTINEL_ROOT.

Bug: 24613815
Change-Id: I96429d75395edfe109222e88d31cdc0bd87a7767
diff --git a/tools/ahat/src/OverviewHandler.java b/tools/ahat/src/OverviewHandler.java
index e86679f..0fe4fba 100644
--- a/tools/ahat/src/OverviewHandler.java
+++ b/tools/ahat/src/OverviewHandler.java
@@ -50,7 +50,7 @@
     printHeapSizes(doc, query);
 
     DocString menu = new DocString();
-    menu.appendLink(DocString.uri("roots"), DocString.text("Roots"));
+    menu.appendLink(DocString.uri("rooted"), DocString.text("Rooted"));
     menu.append(" - ");
     menu.appendLink(DocString.uri("site"), DocString.text("Allocations"));
     menu.append(" - ");