Remove cc::Layer fixed and sticky position constraints

They were set by blink before BlinkGenPropertyTrees when
cc:PropertyTreeBuilder used them to generate property trees at
cc side. Now blink generate property trees directly, so remove them.

Bug: 994361, 754339, 993936
Change-Id: I98559a49778ef6f14f96de61f1f6f54ad16631b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1767492
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690970}

• cc/BUILD.gn[diff]
• cc/layers/layer.cc[diff]
• cc/layers/layer.h[diff]
• cc/layers/layer_impl.h[diff]
• cc/layers/layer_impl_test_properties.h[diff]
• cc/layers/layer_position_constraint.cc[Deleted - diff]
• cc/layers/layer_position_constraint.h[Deleted - diff]
• cc/layers/layer_position_constraint_unittest.cc[Deleted - diff]
• cc/layers/layer_sticky_position_constraint.cc[Deleted - diff]
• cc/layers/layer_unittest.cc[diff]
• cc/test/property_tree_test_utils.cc[diff]
• cc/test/property_tree_test_utils.h[diff]
• cc/trees/layer_tree_host.cc[diff]
• cc/trees/layer_tree_host_common.cc[diff]
• cc/trees/layer_tree_host_common_unittest.cc[diff]
• cc/trees/layer_tree_host_unittest.cc[diff]
• cc/trees/layer_tree_host_unittest_picture.cc[diff]
• cc/trees/layer_tree_host_unittest_scroll.cc[diff]
• cc/trees/layer_tree_impl_unittest.cc[diff]
• cc/trees/property_tree.cc[diff]
• cc/trees/property_tree.h[diff]
• cc/trees/property_tree_builder.cc[diff]
• cc/trees/sticky_position_constraint.cc[Added - diff]
• cc/trees/sticky_position_constraint.h[Renamed from cc/layers/layer_sticky_position_constraint.h - diff]
• cc/trees/transform_node.cc[diff]
• cc/trees/transform_node.h[diff]
• third_party/blink/renderer/core/exported/web_layer_test.cc[diff]
• third_party/blink/renderer/core/inspector/DEPS[diff]
• third_party/blink/renderer/core/inspector/inspector_layer_tree_agent.cc[diff]
• third_party/blink/renderer/core/page/scrolling/scrolling_coordinator_test.cc[diff]
• third_party/blink/renderer/core/paint/paint_property_tree_builder.cc[diff]
• third_party/blink/renderer/core/paint/paint_property_tree_builder_test.cc[diff]
• third_party/blink/renderer/platform/graphics/compositing/property_tree_manager.cc[diff]
• third_party/blink/renderer/platform/graphics/graphics_layer.h[diff]
• third_party/blink/renderer/platform/graphics/paint/transform_paint_property_node.h[diff]
• third_party/blink/tools/blinkpy/presubmit/audit_non_blink_usage.py[diff]