[chromium] Fix compiler warning in CCSchedulerTest.cpp with gcc 4.6.3

[chromium] Fix compiler warning in CCSchedulerTest.cpp with gcc 4.6.3
https://bugs.webkit.org/show_bug.cgi?id=85110

Reviewed by James Robinson.

Using gcc 4.6.3 (default on Precise), I get:
third_party/WebKit/Source/WebKit/chromium/tests/CCSchedulerTest.cpp:188:5: error: converting 'false' to pointer type
for argument 1 of 'char testing::internal::IsNullLiteralHelper(testing::internal::Secret*)' [-Werror=conversion-null]

* tests/CCSchedulerTest.cpp:
(WebKitTests::TEST):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@115527 268f45cc-cd09-0410-ab3c-d52691b4dbfc