change sqlite3-ruby => sqlite3 in the generators

railties/lib/rails/generators/app_base.rb

@@ -112,12 +112,7 @@ module Rails
       end
 
       def database_gemfile_entry
-        entry = ""
-        unless options[:skip_active_record]
-          entry = "gem '#{gem_for_database}'"
-          entry << ", :require => '#{require_for_database}'" if require_for_database
-        end
-        entry
+        options[:skip_active_record] ? "" : "gem '#{gem_for_database}'"
       end
 
       def rails_gemfile_entry
@@ -150,19 +145,12 @@ gem 'rails', '#{Rails::VERSION::STRING}'
         case options[:database]
         when "oracle"     then "ruby-oci8"
         when "postgresql" then "pg"
-        when "sqlite3"    then "sqlite3-ruby"
         when "frontbase"  then "ruby-frontbase"
         when "mysql"      then "mysql2"
         else options[:database]
         end
       end
 
-      def require_for_database
-        case options[:database]
-        when "sqlite3" then "sqlite3"
-        end
-      end
-
       def bundle_if_dev_or_edge
         bundle_command = File.basename(Thor::Util.ruby_command).sub(/ruby/, 'bundle')
         run "#{bundle_command} install" if dev_or_edge?

railties/lib/rails/generators/rails/app/templates/Gemfile

@@ -17,7 +17,7 @@ source 'http://rubygems.org'
 # Bundle the extra gems:
 # gem 'bj'
 # gem 'nokogiri'
-# gem 'sqlite3-ruby', :require => 'sqlite3'
+# gem 'sqlite3'
 # gem 'aws-s3', :require => 'aws/s3'
 
 # Bundle gems for the local environment. Make sure to

railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml

@@ -1,5 +1,5 @@
 # SQLite version 3.x
-#   gem install sqlite3-ruby (not necessary on OS X Leopard)
+#   gem install sqlite3
 development:
   adapter: sqlite3
   database: db/development.sqlite3

railties/test/generators/app_generator_test.rb

@@ -106,7 +106,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
   def test_config_database_is_added_by_default
     run_generator
     assert_file "config/database.yml", /sqlite3/
-    assert_file "Gemfile", /^gem\s+["']sqlite3-ruby["'],\s+:require\s+=>\s+["']sqlite3["']$/
+    assert_file "Gemfile", /^gem\s+["']sqlite3["']$/
   end
 
   def test_config_another_database

railties/test/generators/plugin_new_generator_test.rb

@@ -68,7 +68,7 @@ class PluginNewGeneratorTest < Rails::Generators::TestCase
   def test_database_entry_is_assed_by_default_in_full_mode
     run_generator([destination_root, "--full"])
     assert_file "test/dummy/config/database.yml", /sqlite/
-    assert_file "Gemfile", /^gem\s+["']sqlite3-ruby["'],\s+:require\s+=>\s+["']sqlite3["']$/
+    assert_file "Gemfile", /^gem\s+["']sqlite3["']$/
   end
 
   def test_config_another_database