Remove Regress2107 test, which is fundamentally flaky

Remove Regress2107 test, which is fundamentally flaky

R=hpayer@chromium.org, svenpanne@chromium.org
BUG=

[Erik Corry, 2014-09-19 06:59:56]

The test makes calls to a heuristic API method and expects predictable results.
After https://codereview.chromium.org/576093002/ its innate flakiness has become
more obvious.

If you run with GC tracing flags you can see that the GC system is choosing to
only perform a newspace collection when advised that there is idle time.  That
seems fundamentally OK, so the test should not expect all garbage to be found.

Output from a trace:

=== cctest/test-api/Regress2107 ===                    
initial_size: 883260
[25849]        3 ms: Mark-sweep 0.8 (18.1) -> 0.8 (18.1) MB, 2.0 ms [idle
notification: finalize idle round] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 2 ms [full GC]
[25849]        8 ms: Mark-sweep 4.8 (22.1) -> 0.8 (19.1) MB, 2.0 ms [idle
notification: contexts disposed] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 2 ms [full GC]
[25849]       11 ms: Mark-sweep 4.8 (22.1) -> 0.8 (20.1) MB, 1.7 ms [idle
notification: contexts disposed] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 1 ms [full GC]
[25849]       15 ms: Mark-sweep 4.8 (23.1) -> 0.8 (20.1) MB, 1.7 ms [idle
notification: contexts disposed] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 1 ms [full GC]
[25849]       18 ms: Mark-sweep 4.8 (23.1) -> 0.8 (20.1) MB, 1.7 ms [idle
notification: contexts disposed] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 1 ms [full GC]
[25849]       21 ms: Mark-sweep 4.8 (23.1) -> 0.8 (20.1) MB, 1.6 ms [idle
notification: contexts disposed] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 1 ms [full GC]
[25849]       24 ms: Mark-sweep 4.8 (23.1) -> 0.8 (20.1) MB, 1.7 ms [idle
notification: contexts disposed] [GC in old space requested].
Idle notification: requested idle time 1000 ms, actual time 1 ms [full GC]
[25849]       26 ms: Scavenge 4.8 (23.1) -> 4.8 (23.1) MB, 0.2 ms [idle
notification: scavenge].
Idle notification: requested idle time 1000 ms, actual time 0 ms [scavenge]
[25849]       29 ms: Scavenge 8.6 (26.1) -> 8.6 (27.1) MB, 0.3 ms [idle
notification: scavenge].
[IncrementalMarking] Start
[IncrementalMarking] Start sweeping.
Idle notification: requested idle time 1000 ms, actual time 0 ms [scavenge]
Idle notification: requested idle time 1000 ms, actual time 0 ms [done]
final_size: 9021160
#
# Fatal error in ../test/cctest/test-api.cc, line 17854
# CHECK((final_size) < (initial_size + 1)) failed
#

[Erik Corry, 2014-09-19 08:47:25]

This is no longer needed after https://codereview.chromium.org/586643002