Move HTTPRequest.cpp/.h to platform/

BUG=297477

Review URL: https://codereview.chromium.org/26970003

git-svn-id: svn://svn.chromium.org/blink/trunk@159536 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move ImageOrientation.cpp/.h to platform/

BUG=297477

Review URL: https://codereview.chromium.org/26931004

git-svn-id: svn://svn.chromium.org/blink/trunk@159537 bbb929c8-8fbe-4397-9dbb-9b2b20218538