GLSL backend was assuming that a for-loop will always have a condition. But according to GLSL ES 1.0, the condition is optional.
BUG=50
Review URL: http://codereview.appspot.com/2489042

git-svn-id: https://angleproject.googlecode.com/svn/trunk@451 736b8ea6-26fd-11df-bfd4-992fa37f6226
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