Set bottle download strategy directly

We know what strategy we want, so going through DownloadStrategyDetector
is wasted work. Now we can remove those patterns from the detector and
have two fewer branches each time through.

Library/Homebrew/download_strategy.rb

@@ -828,8 +828,6 @@ class DownloadStrategyDetector
       SubversionDownloadStrategy
     when %r[^https?://(.+?\.)?sourceforge\.net/hgweb/]
       MercurialDownloadStrategy
-    when bottle_native_regex, bottle_regex
-      CurlBottleDownloadStrategy
     else
       CurlDownloadStrategy
     end

Library/Homebrew/software_spec.rb

@@ -131,6 +131,7 @@ class Bottle
       :revision => spec.revision,
       :tag => spec.current_tag
     )
+    @resource.download_strategy = CurlBottleDownloadStrategy
     @resource.version = f.pkg_version
     @resource.checksum = spec.checksum
     @prefix = spec.prefix

Library/Homebrew/test/test_download_strategies.rb

@@ -1,6 +1,5 @@
 require 'testing_env'
 require 'download_strategy'
-require 'bottles' # XXX: hoist these regexps into constants in Pathname?
 
 class ResourceDouble
   attr_reader :url, :specs

Library/Homebrew/test/test_software_spec.rb

@@ -1,6 +1,5 @@
 require 'testing_env'
 require 'software_spec'
-require 'bottles'
 
 class SoftwareSpecTests < Test::Unit::TestCase
   include VersionAssertions