Revert of Remove constructor from remaining functions that aren't constructors

Revert of Remove constructor from remaining functions that aren't constructors (patchset #1 id:1 of https://codereview.chromium.org/2124183003/ )

Reason for revert:
Reverting while investigating blob_storage failures

Original issue's description:
> Remove constructor from remaining functions that aren't constructors
> 
> BUG=625823
> R=haraken@chromium.org,pfeldman@chromium.org
> 
> Committed: https://crrev.com/587b0b37724cdfc0eec5ed091b94eb8276bc05ce
> Cr-Commit-Position: refs/heads/master@{#404137}

TBR=haraken@chromium.org,pfeldman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=625823

[jochen (gone - plz use gerrit), 2016-07-12 17:50:26]

The CQ bit was checked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2016-07-12 17:50:27]

Created Revert of Remove constructor from remaining functions that aren't
constructors

[commit-bot: I haz the power, 2016-07-12 17:51:53]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jochen (gone - plz use gerrit), 2016-07-12 21:00:23]

The CQ bit was unchecked by jochen@chromium.org

[haraken, 2016-07-13 00:00:28]

LGTM

[xdai1, 2016-08-17 22:18:58]

This CL needs to merge into M53(branch head: 2785). Otherwise the M53 build
fails at compile time.

[xdai1, 2016-08-18 00:35:25]

On 2016/08/17 22:18:58, xdai1 wrote:
> This CL needs to merge into M53(branch head: 2785). Otherwise the M53 build
> fails at compile time.

Filed the bug crbug.com/638789