Removed support for IE <10

[#150527985]

spec/core/matchers/toEqualSpec.js

@@ -299,22 +299,7 @@ describe("toEqual", function() {
     expect(compareEquals(actual, expected).message).toEqual(message);
   });
 
-  function constructorIsNotEnumerable() {
-    // in IE8, the constructor property is not enumerable, even if it is an
-    // own property of the object.
-    // Objects that differ only by an own `constructor` property are thus
-    // considered equal in IE8.
-    for (var key in {constructor: 1}) {
-      return false;
-    }
-    return true;
-  }
-
   it("reports mismatches between objects with their own constructor property", function () {
-    if (constructorIsNotEnumerable()) {
-      return;
-    }
-
     function Foo() {}
     function Bar() {}
 
@@ -326,10 +311,6 @@ describe("toEqual", function() {
   });
 
   it("reports mismatches between an object with a real constructor and one with its own constructor property", function () {
-    if (constructorIsNotEnumerable()) {
-      return;
-    }
-
     function Foo() {}
     function Bar() {}