Upgrade V8 Benchmark from v4 to v6.

Upgrade V8 Benchmark from v4 to v6.

The scores across different versions of the V8 benchmark are NOT comparable. So
this will change the raw score number and expectations will need to be reset.

BUG=None
TEST=out/Debug/performance_ui_tests --gtest_filter=V8BenchmarkTest.Perf --run-v8-benchmark
TBR=cmp

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=112219

[commit-bot: I haz the power, 2011-11-30 14:09:43]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tonyg@chromium.org/8749001/1

[commit-bot: I haz the power, 2011-11-30 14:10:27]

Presubmit check for 8749001-1 failed and returned exit status 1.

Running presubmit commit checks ...
  checking license took a long time: 29180ms

** Presubmit Messages **
--tbr was specified, skipping OWNERS check

** Presubmit Warnings **
Found lines longer than 80 characters (first 5 shown).
  chrome/test/data/v8_benchmark/deltablue.js, line 358, 101 chars \
  chrome/test/data/v8_benchmark/regexp.js, line 66, 97 chars \
  chrome/test/data/v8_benchmark/regexp.js, line 67, 83 chars \
  chrome/test/data/v8_benchmark/regexp.js, line 100, 81 chars \
  chrome/test/data/v8_benchmark/regexp.js, line 112, 124 chars

License must match:
.*? Copyright \(c\) 2011 The Chromium Authors\. All rights reserved\.\n.*? Use
of this source code is governed by a BSD-style license that can be\n.*? found in
the LICENSE file\.\n
Found a bad license header in these files:
  chrome/test/data/v8_benchmark/base.js \
  chrome/test/data/v8_benchmark/crypto.js \
  chrome/test/data/v8_benchmark/deltablue.js \
  chrome/test/data/v8_benchmark/earley-boyer.js \
  chrome/test/data/v8_benchmark/raytrace.js \
  chrome/test/data/v8_benchmark/regexp.js \
  chrome/test/data/v8_benchmark/richards.js \
  chrome/test/data/v8_benchmark/splay.js

Presubmit checks took 29.9s to calculate.

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[cmp, 2011-11-30 18:41:16]

lgtm