Removed depracated methods selectedTextRange and insertionPointLineNumber from accessibility API in…

Removed depracated methods selectedTextRange and insertionPointLineNumber from accessibility API in content_shell.

BUG=
R=dmazzoni

Committed: https://crrev.com/b25c70f6d1d49189a38be624f2c21c09d035aab4
Cr-Commit-Position: refs/heads/master@{#326327}

[chromium-reviews, 2015-04-15 03:57:47]

This CL will not be submitted until CL 1088043002 and two future CLs 
dealing with text selection in content editables and modernizing a 
handful of other tests have been submitted.

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[dmazzoni, 2015-04-15 05:41:00]

lgtm

[nektarios, 2015-04-22 16:43:21]

The CQ bit was checked by nektar@chromium.org

[commit-bot: I haz the power, 2015-04-22 16:43:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1089503002/1

[commit-bot: I haz the power, 2015-04-22 17:22:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-22 17:24:22]

Patchset 1 (id:??) landed as
https://crrev.com/b25c70f6d1d49189a38be624f2c21c09d035aab4
Cr-Commit-Position: refs/heads/master@{#326327}