Revert "[Android WebView] Terminate execution of stuck JS code on navigation requests"

Revert "[Android WebView] Terminate execution of stuck JS code on navigation requests"

This reverts commit 69538c3b061eb767d25d32edd89626282c030d86.

As described in the bug, the proposed approach is invalid, as Blink's bindings
code isn't ready to deal with terminated scripts properly, resulting in random
crashes. Hence reverting the patch.

BUG=390906
Committed: https://chromium.googlesource.com/chromium/src/+/a4afac27818dfb1d25d77a4f9a505095156032e9

[mnaganov (inactive), 2014-09-03 16:28:05]

Committed patchset #1 (id:1) manually as a4afac2.

[commit-bot: I haz the power, 2014-09-10 03:26:02]

Patchset 1 (id:??) landed as
https://crrev.com/a4afac27818dfb1d25d77a4f9a505095156032e9
Cr-Commit-Position: refs/heads/master@{#293146}