Removed useless "spec"s

It is not specific to particular methods that keyword option
arguments are coerced to `Hash`es using `to_hash` method.

spec/ruby/core/array/sample_spec.rb

@@ -65,26 +65,6 @@
   end
 
   describe "with options" do
-    ruby_version_is ""..."2.8" do
-      # keyword argument since 2.8
-      it "calls #to_hash to convert the passed Object" do
-        obj = mock("array_sample")
-        obj.should_receive(:to_hash).and_return({})
-        obj.should_not_receive(:to_int)
-
-        [1, 2].sample(obj).should be_an_instance_of(Fixnum)
-      end
-
-      it "calls #to_int on the first argument and #to_hash on the second when passed Objects" do
-        count = mock("array_sample_count")
-        count.should_receive(:to_int).and_return(2)
-        options = mock("array_sample_options")
-        options.should_receive(:to_hash).and_return({})
-
-        [1, 2].sample(count, options).size.should == 2
-      end
-    end
-
     it "calls #rand on the Object passed by the :random key in the arguments Hash" do
       obj = mock("array_sample_random")
       obj.should_receive(:rand).and_return(0.5)

spec/ruby/core/array/shuffle_spec.rb

@@ -25,15 +25,6 @@
     ArraySpecs::MyArray[1, 2, 3].shuffle.should be_an_instance_of(Array)
   end
 
-  ruby_version_is ""..."2.8" do
-    # keyword argument since 2.8
-    it "attempts coercion via #to_hash" do
-      obj = mock('hash')
-      obj.should_receive(:to_hash).once.and_return({})
-      [2, 3].shuffle(obj)
-    end
-  end
-
   it "calls #rand on the Object passed by the :random key in the arguments Hash" do
     obj = mock("array_shuffle_random")
     obj.should_receive(:rand).at_least(1).times.and_return(0.5)