reland 31875. Revert was:
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Revert 31875 to see whether it fixes reliability bot.

BUG=25677
TEST=None
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TBR=huanr
Review URL: http://codereview.chromium.org/397017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@32112 0039d316-1c4b-4281-b951-d872f2087c98

• base/file_util.cc[diff]
• base/file_util.h[diff]
• base/file_util_posix.cc[diff]
• base/file_util_win.cc[diff]
• build/common.gypi[diff]
• chrome/browser/profile.cc[diff]
• chrome/browser/renderer_host/browser_render_process_host.cc[diff]
• chrome/browser/spellcheck_host.cc[diff]
• chrome/browser/spellcheck_host.h[diff]
• chrome/chrome.gyp[diff]
• chrome/common/notification_type.h[diff]
• chrome/common/render_messages.h[diff]
• chrome/common/render_messages_internal.h[diff]
• chrome/renderer/render_thread.cc[diff]
• chrome/renderer/render_thread.h[diff]
• chrome/renderer/render_view.cc[diff]
• chrome/renderer/spellchecker/spellcheck.cc[diff]
• chrome/renderer/spellchecker/spellcheck.h[diff]
• ipc/ipc.gyp[diff]
• ipc/ipc_platform_file.h[Added - diff]