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This patch moves Capitalize (titlecase) function from LayoutText
to platform/text in order to share with LayoutNG.

Bug: 636993
Change-Id: I1d0e78139424a20d4184976d1f920c75fc8190ac
Reviewed-on: https://chromium-review.googlesource.com/1047925Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557113}