Change imm32_manager_ using scoped_ptr for mock testing.

We will add Imm32Manager mocking test.

BUG=244688

Review URL: https://chromiumcodereview.appspot.com/21835006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@215590 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed