[CSS Typed OM] Fix test bug errors, remove forgotten expectation files

third_party/WebKit/LayoutTests/typedcssom/computedstyle/computedStylePropertyMap.html

Index: third_party/WebKit/LayoutTests/typedcssom/computedstyle/computedStylePropertyMap.html
diff --git a/third_party/WebKit/LayoutTests/typedcssom/computedstyle/computedStylePropertyMap.html b/third_party/WebKit/LayoutTests/typedcssom/computedstyle/computedStylePropertyMap.html
index 7755f5bfb019ef451c6d5ab010e1ee47c6a9f72f..6e3fbab950f26d7a6d81b0f64483568448117b31 100644
--- a/third_party/WebKit/LayoutTests/typedcssom/computedstyle/computedStylePropertyMap.html
+++ b/third_party/WebKit/LayoutTests/typedcssom/computedstyle/computedStylePropertyMap.html
@@ -37,7 +37,7 @@ test(function() {
 }, 'Unsupported and unserializable property returns null.');
 
 test(function() {
-  assert_throws(null, function() { computedStyleMap.get('bananas'); });
+  assert_throws(new TypeError(), function() { computedStyleMap.get('bananas'); });
 }, 'get() throws for an invalid property.');
 
 test(function() {
@@ -45,7 +45,7 @@ test(function() {
 }, 'has() return false for an unsupported property.');
 
 test(function() {
-  assert_throws(null, function() { computedStyleMap.has('bananas'); });
+  assert_throws(new TypeError(), function() { computedStyleMap.has('bananas'); });
 }, 'has() throws for an invalid property.');
 
 test(function() {