Use simple concat of substrings instead of ReplaceStringBuilder for non-global replacements.
Use simple concat of substrings instead of ReplaceStringBuilder for non-global replacements.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10134057

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@11448 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh