Changing connections to take a ConnectionParams instead of a pipe handle.
ConnectionParams will be augmented in a follow up patch to take extra
objects on Android (channels to support sending Parcelable instances).

BUG=699311
[email protected],[email protected],[email protected],[email protected]

Review-Url: https://codereview.chromium.org/2738853002
Cr-Commit-Position: refs/heads/master@{#455921}

• chrome/browser/chromeos/arc/video/gpu_arc_video_service_host.cc[diff]
• chrome/service/service_utility_process_host.cc[diff]
• chrome/test/base/mojo_test_connector.cc[diff]
• chrome/utility/importer/firefox_importer_unittest_utils_mac.cc[diff]
• components/arc/arc_session.cc[diff]
• components/nacl/broker/nacl_broker_listener.cc[diff]
• content/browser/child_process_launcher.cc[diff]
• mojo/edk/embedder/BUILD.gn[diff]
• mojo/edk/embedder/connection_params.cc[Added - diff]
• mojo/edk/embedder/connection_params.h[Added - diff]
• mojo/edk/embedder/embedder.cc[diff]
• mojo/edk/embedder/embedder_unittest.cc[diff]
• mojo/edk/embedder/pending_process_connection.cc[diff]
• mojo/edk/embedder/pending_process_connection.h[diff]
• mojo/edk/system/broker_host.cc[diff]
• mojo/edk/system/channel.h[diff]
• mojo/edk/system/channel_posix.cc[diff]
• mojo/edk/system/channel_win.cc[diff]
• mojo/edk/system/core.cc[diff]
• mojo/edk/system/core.h[diff]
• mojo/edk/system/node_channel.cc[diff]
• mojo/edk/system/node_channel.h[diff]
• mojo/edk/system/node_controller.cc[diff]
• mojo/edk/system/node_controller.h[diff]
• mojo/edk/test/multiprocess_test_helper.cc[diff]
• remoting/host/win/unprivileged_process_delegate.cc[diff]
• remoting/host/win/wts_session_process_delegate.cc[diff]
• services/service_manager/runner/host/service_process_launcher.cc[diff]
• services/service_manager/tests/service_manager/service_manager_unittest.cc[diff]
• services/service_manager/tests/util.cc[diff]