Revert 59119 - Removed includion of <iostream> from logging.h.
Revert 59119 - Removed includion of <iostream> from logging.h.

So that it does not introduce static initializers into including files.

TEST=try
BUG=54904

Review URL: http://codereview.chromium.org/3354018

Reverting due to serious perf regression in some cases.
TBR=apatrick@chromium.org
Review URL: http://codereview.chromium.org/3358030

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@59203 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser