Remove #=== quirk

Makes it consistent with Relation. Can't see a use for this.

activerecord/lib/active_record/associations/collection_proxy.rb

@@ -79,12 +79,6 @@ module ActiveRecord
         load_target == other
       end
 
-      # Forwards <tt>===</tt> explicitly to the \target because the instance method
-      # removal above doesn't catch it. Loads the \target if needed.
-      def ===(other)
-        other === load_target
-      end
-
       def to_ary
         load_target.dup
       end

activerecord/test/cases/associations/has_and_belongs_to_many_associations_test.rb

@@ -123,11 +123,6 @@ class HasAndBelongsToManyAssociationsTest < ActiveRecord::TestCase
     assert active_record.developers.include?(david)
   end
 
-  def test_triple_equality
-    assert !(Array === Developer.find(1).projects)
-    assert Developer.find(1).projects === Array
-  end
-
   def test_adding_single
     jamis = Developer.find(2)
     jamis.projects.reload # causing the collection to load

activerecord/test/cases/associations/has_many_associations_test.rb

@@ -326,12 +326,6 @@ class HasManyAssociationsTest < ActiveRecord::TestCase
     authors(:david).readonly_comments.each { |c| assert c.readonly? }
   end
 
-  def test_triple_equality
-    # sometimes tests on Oracle fail if ORDER BY is not provided therefore add always :order with :first
-    assert !(Array === Firm.scoped(:order => "id").first.clients)
-    assert Firm.scoped(:order => "id").first.clients === Array
-  end
-
   def test_finding_default_orders
     assert_equal "Summit", Firm.scoped(:order => "id").first.clients.first.name
   end