Move the Web Bluetooth implementation from child/ to renderer/.

Move the Web Bluetooth implementation from child/ to renderer/.

Since requestDevice() uses the Frame, and we don't support workers yet, jochen@
wants us to implement in renderer/ for now.

This is the second of a 3-patch sequence:
1. Attach a frame-specific WebBluetooth in Blink. (https://codereview.chromium.org/1228283003)
2. Move Web Bluetooth from content/child/ to content/renderer/ (This patch)
3. Put the RenderFrame's ID in that WebBluetooth and plumb it back to the browser. (https://codereview.chromium.org/1228113004/)

BUG=500989
Committed: https://crrev.com/f89a11b5f43fe6c3a0f31466fdf83f65c5d08f10
Cr-Commit-Position: refs/heads/master@{#339573}

[Jeffrey Yasskin, 2015-07-16 22:46:33]

jyasskin@chromium.org changed reviewers:
+ jochen@chromium.org, scheib@chromium.org

[Jeffrey Yasskin, 2015-07-16 22:46:34]

For posterity, Jochen's request is in
https://codereview.chromium.org/1228113004/#msg14.

[jochen (gone - plz use gerrit), 2015-07-17 09:29:02]

lgtm

[scheib, 2015-07-17 19:15:45]

LGTM

[Jeffrey Yasskin, 2015-07-17 23:51:28]

The CQ bit was checked by jyasskin@chromium.org

[commit-bot: I haz the power, 2015-07-17 23:52:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1234413006/1

[commit-bot: I haz the power, 2015-07-18 00:01:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-18 00:01:25]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Jeffrey Yasskin, 2015-07-18 00:03:11]

jyasskin@chromium.org changed reviewers:
+ armansito@chromium.org

[Jeffrey Yasskin, 2015-07-18 00:03:11]

Arman, can you approve for

** Presubmit ERRORS **
Missing LGTM from OWNERS of dependencies added to DEPS:
    '+device/bluetooth',

[armansito, 2015-07-20 23:01:40]

lgtm

[Jeffrey Yasskin, 2015-07-20 23:01:54]

The CQ bit was checked by jyasskin@chromium.org

[Jeffrey Yasskin, 2015-07-20 23:01:54]

The patchset sent to the CQ was uploaded after l-g-t-m from scheib@chromium.org,
jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1234413006/#ps20001
(title: "Rebase")

[commit-bot: I haz the power, 2015-07-20 23:02:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1234413006/20001

[commit-bot: I haz the power, 2015-07-21 00:27:57]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-21 00:28:52]

Patchset 2 (id:??) landed as
https://crrev.com/f89a11b5f43fe6c3a0f31466fdf83f65c5d08f10
Cr-Commit-Position: refs/heads/master@{#339573}