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There are two syntaxes to declare an Objective-C block taking
no arguments and returning no value (so of type void(^)()):
1. ^{ ... } or 2. ^() { ... }.

The syntax 1. appears to be the most popular in the codebase
with at the time of writing 11643 references while 2. only
had 58.

Conversion was automated with the following command:

    sed -i '' -e 's/\^ *() *{/^{/' $(git grep -l '\^ *() *{')

Bug: none
Change-Id: I2c799e1931c8d87352040bc91d56a8368b17cb89
Reviewed-on: https://chromium-review.googlesource.com/1022713Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552512}