Remove obsolete typingmonitor.cc/.h files.

Remove obsolete typingmonitor.cc/.h files.

To be committed once https://codereview.webrtc.org/1327033002/ has propagated to Chromium, and Chromium's libjingle.gyp has been updated.

BUG=webrtc:4690
Committed: https://crrev.com/fab882b193fa44f4c83c76fcbf67683b179978cf
Cr-Commit-Position: refs/heads/master@{#9919}

[the sun, 2015-09-07 11:26:37]

solenberg@webrtc.org changed reviewers:
+ tommi@webrtc.org

[tommi, 2015-09-07 13:59:47]

lgtm

[the sun, 2015-09-10 12:19:15]

The CQ bit was checked by solenberg@webrtc.org

[the sun, 2015-09-10 12:19:16]

The patchset sent to the CQ was uploaded after l-g-t-m from tommi@webrtc.org
Link to the patchset: https://codereview.webrtc.org/1308663005/#ps20001 (title:
"rebase")

[commit-bot: I haz the power, 2015-09-10 12:19:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1308663005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1308663005/20001

[commit-bot: I haz the power, 2015-09-10 14:19:42]

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

[commit-bot: I haz the power, 2015-09-10 14:19:43]

Try jobs failed on following builders:
  android on tryserver.webrtc (JOB_TIMED_OUT, no build URL)
  android_arm64_rel on tryserver.webrtc (JOB_TIMED_OUT, no build URL)
  android_rel on tryserver.webrtc (JOB_TIMED_OUT, no build URL)

[the sun, 2015-09-10 14:20:57]

The CQ bit was checked by solenberg@webrtc.org

[commit-bot: I haz the power, 2015-09-10 14:21:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1308663005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1308663005/20001

[commit-bot: I haz the power, 2015-09-10 15:38:16]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-10 15:38:27]

Patchset 2 (id:??) landed as
https://crrev.com/fab882b193fa44f4c83c76fcbf67683b179978cf
Cr-Commit-Position: refs/heads/master@{#9919}