Don't insert redundant BR for merging

LayoutTests/editing/deleting/delete-br-001.html

Index: LayoutTests/editing/deleting/delete-br-001.html
diff --git a/LayoutTests/editing/deleting/delete-br-001.html b/LayoutTests/editing/deleting/delete-br-001.html
index a5cd2a3c1e34d4796cc0c23e9a48317e4cecfc98..99a6390c3d65a6fabe3f22696af5fee97c391b95 100644
--- a/LayoutTests/editing/deleting/delete-br-001.html
+++ b/LayoutTests/editing/deleting/delete-br-001.html
@@ -23,9 +23,9 @@ function testIt(nth, numberOfDeletes, expectedOffset, expectedHTML) {
 }
 
 testIt(0, 1, 3, 'abc<br id="b"><br id="c">def');
-testIt(1, 1, 2, 'abc<br id="a"><br>def');
+testIt(1, 1, 2, 'abc<br id="a"><br id="c">def');
 testIt(2, 1, 0, 'abc<br id="a"><br id="b">def');
-testIt(1, 2, 3, 'abc<br>def');
+testIt(1, 2, 3, 'abc<br id="c">def');
 testIt(2, 2, 0, 'abc<br id="a">def');
 testIt(2, 3, 3, 'abcdef');