Add whitelist for extensions to put <all_urls> in externally_connectable

Add whitelist for extensions to put <all_urls> in externally_connectable

Normally extensions must specify a concrete list of url patterns. But with this
patch, extensions on the whitelist can do:

 "permissions": ["externally_connectable.all_urls"],
 "externally_connectable": {
    "matches": ["<all_urls>"]
  }

and they will be able to be connected to from any url.

Also add an entry to the whitelist for the CryptoToken extension.

BUG=417062, 417494
Committed: https://crrev.com/860c6547ac322954027fc226e75881f15585f14b
Cr-Commit-Position: refs/heads/master@{#296799}

[asargent_no_longer_on_chrome, 2014-09-24 23:17:43]

asargent@chromium.org changed reviewers:
+ miket@chromium.org

[miket_OOO, 2014-09-25 00:29:51]

lgtm

[asargent_no_longer_on_chrome, 2014-09-25 16:01:53]

The CQ bit was checked by asargent@chromium.org

[commit-bot: I haz the power, 2014-09-25 16:02:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/599163003/1

[commit-bot: I haz the power, 2014-09-25 17:11:43]

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

[commit-bot: I haz the power, 2014-09-25 17:11:44]

Try jobs failed on following builders:
  linux_chromium_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[asargent_no_longer_on_chrome, 2014-09-25 19:52:39]

Updated CL with a fix for the unit test and hitting CQ button again.

[asargent_no_longer_on_chrome, 2014-09-25 19:52:42]

The CQ bit was checked by asargent@chromium.org

[commit-bot: I haz the power, 2014-09-25 19:54:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/599163003/20001

[commit-bot: I haz the power, 2014-09-25 21:48:15]

Committed patchset #2 (id:20001) as 82ec43558a91d6f0a6c09f472be1e49057593ac3

[commit-bot: I haz the power, 2014-09-25 21:48:51]

Patchset 2 (id:??) landed as
https://crrev.com/860c6547ac322954027fc226e75881f15585f14b
Cr-Commit-Position: refs/heads/master@{#296799}