"Mac OS X" -> "OS X" in copy

Library/Homebrew/formula_support.rb

@@ -25,19 +25,19 @@ class KegOnlyReason
   def to_s
     case @reason
     when :provided_by_osx then <<-EOS
-Mac OS X already provides this software and installing another version in
+OS X already provides this software and installing another version in
 parallel can cause all kinds of trouble.
 
 #{@explanation}
 EOS
     when :shadowed_by_osx then <<-EOS
-Mac OS X provides similar software, and installing this software in
+OS X provides similar software, and installing this software in
 parallel can cause all kinds of trouble.
 
 #{@explanation}
 EOS
     when :provided_pre_mountain_lion then <<-EOS
-Mac OS X already provides this software in versions before Mountain Lion.
+OS X already provides this software in versions before Mountain Lion.
 
 #{@explanation}
 EOS

Library/Homebrew/global.rb

@@ -30,7 +30,7 @@ RUBY_BIN = RUBY_PATH.dirname
 if RUBY_PLATFORM =~ /darwin/
   MACOS_FULL_VERSION = `/usr/bin/sw_vers -productVersion`.chomp
   MACOS_VERSION = MACOS_FULL_VERSION[/10\.\d+/]
-  OS_VERSION = "Mac OS X #{MACOS_FULL_VERSION}"
+  OS_VERSION = "OS X #{MACOS_FULL_VERSION}"
 else
   MACOS_FULL_VERSION = MACOS_VERSION = "0"
   OS_VERSION = RUBY_PLATFORM

Library/Homebrew/os/mac/xcode.rb

@@ -20,7 +20,7 @@ module OS
           if MacOS.version > "10.10"
             "7.0"
           else
-            raise "Mac OS X '#{MacOS.version}' is invalid"
+            raise "OS X '#{MacOS.version}' is invalid"
           end
         end
       end