Remove mods-since-v0_4_0.diff from third_party/libjingle

Remove mods-since-v0_4_0.diff from third_party/libjingle

The patch was useful only when we had forked version of libjingle
checked in in chromium, which hasn't been the case for very long
time.

TBR=hclam@chromium.org

Committed: https://crrev.com/304f63b80f9803e28b68a1a9c09fbe5fd238cacd
Cr-Commit-Position: refs/heads/master@{#308129}

[Sergey Ulanov, 2014-12-10 17:41:38]

sergeyu@chromium.org changed reviewers:
+ hellner@chromium.org

[hellner1, 2014-12-12 17:15:56]

lgtm

[Sergey Ulanov, 2014-12-12 17:26:50]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2014-12-12 17:27:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/794643002/1

[commit-bot: I haz the power, 2014-12-12 17:27:43]

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

[commit-bot: I haz the power, 2014-12-12 17:27:44]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Sergey Ulanov, 2014-12-12 17:31:32]

sergeyu@chromium.org changed reviewers:
+ hclam@chromium.org

[Sergey Ulanov, 2014-12-12 17:31:43]

+hclam@ in TBR

[Sergey Ulanov, 2014-12-12 17:31:47]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2014-12-12 17:32:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/794643002/1

[commit-bot: I haz the power, 2014-12-12 18:45:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-12 18:46:11]

Patchset 1 (id:??) landed as
https://crrev.com/304f63b80f9803e28b68a1a9c09fbe5fd238cacd
Cr-Commit-Position: refs/heads/master@{#308129}