Revert 288481 "Use placement new to allocate GPU command buffer ..."
Revert 288481 "Use placement new to allocate GPU command buffer ..."

Placement new seems not to fix it on official builds.

> Use placement new to allocate GPU command buffer entries.
> 
> This isn't as ugly as the crazy null check, and it seems to be compiled correctly.
> 
> BUG=
> 
> Review URL: https://codereview.chromium.org/427003008

BUG=402139
TBR=jbauman@chromium.org

Review URL: https://codereview.chromium.org/465533002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@288732 0039d316-1c4b-4281-b951-d872f2087c98

bright-sparks/chromium-spacewalk,littlstar/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,littlstar/chromium.src,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,littlstar/chromium.src,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,bright-sparks/chromium-spacewalk,bright-sparks/chromium-spacewalk,littlstar/chromium.src,ondra-novak/chromium.src,ondra-novak/chromium.src,littlstar/chromium.src