gpu: IPC minor cleanup

Removing a field we don't use.

BUG=None

Review URL: https://codereview.chromium.org/26971003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228574 0039d316-1c4b-4281-b951-d872f2087c98
Remove NOTIFICATION_WEB_CONTENTS_DESTROYED from the download request limiter.

BUG=170921
TEST=everything still works

Review URL: https://codereview.chromium.org/27122003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228575 0039d316-1c4b-4281-b951-d872f2087c98
Stable blocker: crash extensions::UsbFindDevicesFunction::AsyncWorkStart()

GCC armv7a violated evaluation order of function parameters and exectued
devices.Pass() before devices->begin().

Probably due to optimization with wrong data dependency detection.

BUG=288070

Review URL: https://codereview.chromium.org/27220004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228576 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228575
SVN changes up to revision 228576
Disable a hanging test (LargePostWithNoPacketLoss).

TBR=rtenneti

BUG=307284

Review URL: https://codereview.chromium.org/27238007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228577 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228577