Remove dead code

Formula objects are always constructed with an explicit name, so we no
longer need to special case an empty name or the name "__UNKNOWN__".

Library/Homebrew/download_strategy.rb

@@ -1,5 +1,4 @@
 require 'utils/json'
-require 'erb'
 
 class AbstractDownloadStrategy
   attr_reader :name, :resource
@@ -53,12 +52,8 @@ class VCSDownloadStrategy < AbstractDownloadStrategy
   end
 
   def cache_filename(tag=cache_tag)
-    if name.empty? || name == '__UNKNOWN__'
-      "#{ERB::Util.url_encode(@url)}--#{tag}"
-    else
     "#{name}--#{tag}"
   end
-  end
 
   def cache_tag
     "__UNKNOWN__"
@@ -79,11 +74,7 @@ class CurlDownloadStrategy < AbstractDownloadStrategy
   end
 
   def tarball_path
-    @tarball_path ||= if name.empty? || name == '__UNKNOWN__'
+    @tarball_path ||= Pathname.new("#{HOMEBREW_CACHE}/#{name}-#{resource.version}#{ext}")
-      Pathname.new("#{HOMEBREW_CACHE}/#{basename_without_params}")
-    else
-      Pathname.new("#{HOMEBREW_CACHE}/#{name}-#{resource.version}#{ext}")
-    end
   end
 
   def temporary_path

Library/Homebrew/test/test_download_strategies.rb

@@ -50,16 +50,6 @@ class VCSDownloadStrategyTests < Homebrew::TestCase
     downloader = @strategy.new("baz", @resource)
     assert_equal "baz--foo", downloader.cache_filename("foo")
   end
-
-  def test_empty_name
-    downloader = @strategy.new("", @resource)
-    assert_equal escaped("foo"), downloader.cache_filename("foo")
-  end
-
-  def test_unknown_name
-    downloader = @strategy.new("__UNKNOWN__", @resource)
-    assert_equal escaped("foo"), downloader.cache_filename("foo")
-  end
 end
 
 class DownloadStrategyDetectorTests < Homebrew::TestCase