Remove unnecessary mutex.

The heap leak has since been solved.

R=mstarzinger@chromium.org
BUG=291236

Review URL: https://codereview.chromium.org/25237003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17002 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Function::Call and Object::CallAsFunction APIs should allow v8::Value as a receiver

Since the primitive values can be a receiver of strict mode functions in
ECMA262 5.1th, v8::Function::Call and Object::CallAsFunction should take
v8::Value as a receiver instead of v8::Object.

BUG=v8:2915
TEST=cctest/test-api
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/24920003

Patch from Yusuke Suzuki <yusukesuzuki@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17003 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Split extra checks into extra checks and handle zapping

That will make it easier to turn on handle zapping alone and experiment
with it.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/25250002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17004 ce2b1a6d-e550-0410-aec6-3dcde31c8c00