Speedup AS::Inflector.camelize

Benchmark:
          user     system      total        real
old   5.960000   0.020000   5.980000 (  5.981754)
new   5.740000   0.030000   5.770000 (  5.757201)

1 files changed, 3 insertions, 1 deletions

diff --git a/activesupport/lib/active_support/inflector/methods.rb b/activesupport/lib/active_support/inflector/methods.rb
index 18c94a4997..8e546c0176 100644
--- a/activesupport/lib/active_support/inflector/methods.rb
+++ b/activesupport/lib/active_support/inflector/methods.rb
@@ -72,7 +72,9 @@ module ActiveSupport
       else
         string = string.sub(/^(?:#{inflections.acronym_regex}(?=\b|[A-Z_])|\w)/) { $&.downcase }
       end
-      string.gsub(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{inflections.acronyms[$2] || $2.capitalize}" }.gsub('/', '::')
+      string.gsub!(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{inflections.acronyms[$2] || $2.capitalize}" }
+      string.gsub!('/', '::')
+      string
     end
 
     # Makes an underscored, lowercase form from the expression in the string.