move "check for ruby-prof" from AD/testing/performance_test to AS/testing/performance, where it is actually required

actionpack/lib/action_dispatch/testing/performance_test.rb

@@ -1,6 +1,5 @@
 require 'active_support/testing/performance'
 
-begin
 module ActionDispatch
   # An integration test that runs a code profiler on your test methods.
   # Profiling output for combinations of each test method, measurement, and
@@ -12,6 +11,3 @@ begin
     include ActiveSupport::Testing::Performance
   end
 end
-rescue NameError
-  $stderr.puts "Specify ruby-prof as application's dependency in Gemfile to run benchmarks."
-end

activesupport/lib/active_support/testing/performance.rb

@@ -1,11 +1,15 @@
-begin
-  require 'ruby-prof'
-
 require 'fileutils'
 require 'rails/version'
 require 'active_support/core_ext/class/delegating_attributes'
 require 'active_support/core_ext/string/inflections'
 
+begin
+  require 'ruby-prof'
+rescue LoadError
+  $stderr.puts "Specify ruby-prof as application's dependency in Gemfile to run benchmarks."
+  exit
+end
+
 module ActiveSupport
   module Testing
     module Performance
@@ -421,5 +425,3 @@ begin
     end
   end
 end
-rescue LoadError
-end