Remove PODIntervalTree and machinery.

sky/engine/platform/BUILD.gn

Index: sky/engine/platform/BUILD.gn
diff --git a/sky/engine/platform/BUILD.gn b/sky/engine/platform/BUILD.gn
index 1d8c372ab4ecb892e1f0425a9f55bd13193cf181..583cdb0a95e93128a49e45d1353102fa4bff5827 100644
--- a/sky/engine/platform/BUILD.gn
+++ b/sky/engine/platform/BUILD.gn
@@ -128,11 +128,6 @@ component("platform") {
     "MIMETypeRegistry.h",
     "NotImplemented.cpp",
     "NotImplemented.h",
-    "PODArena.h",
-    "PODFreeListArena.h",
-    "PODInterval.h",
-    "PODIntervalTree.h",
-    "PODRedBlackTree.h",
     "ParsingUtilities.h",
     "Partitions.cpp",
     "Partitions.h",
@@ -289,8 +284,6 @@ component("platform") {
     "fonts/skia/FontPlatformDataSkia.cpp",
     "fonts/skia/SimpleFontDataSkia.cpp",
     "geometry/FloatBoxExtent.h",
-    "geometry/FloatPolygon.cpp",
-    "geometry/FloatPolygon.h",
     "geometry/FloatPoint.cpp",
     "geometry/FloatPoint.h",
     "geometry/FloatPoint3D.cpp",
@@ -717,10 +710,6 @@ test("platform_unittests") {
     "DecimalTest.cpp",
     "LayoutUnitTest.cpp",
     "LifecycleContextTest.cpp",
-    "PODArenaTest.cpp",
-    "PODFreeListArenaTest.cpp",
-    "PODIntervalTreeTest.cpp",
-    "PODRedBlackTreeTest.cpp",
     "PurgeableVectorTest.cpp",
     "SharedBufferTest.cpp",
     "TestingPlatformSupport.cpp",
@@ -737,7 +726,6 @@ test("platform_unittests") {
     "fonts/android/FontCacheAndroidTest.cpp",
     "geometry/FloatBoxTest.cpp",
     "geometry/FloatBoxTestHelpers.cpp",
-    "geometry/FloatPolygonTest.cpp",
     "geometry/FloatRoundedRectTest.cpp",
     "geometry/RegionTest.cpp",
     "geometry/RoundedRectTest.cpp",
@@ -749,7 +737,6 @@ test("platform_unittests") {
     "image-decoders/ImageDecoderTest.cpp",
     "mac/ScrollElasticityControllerTest.mm",
     "network/HTTPParsersTest.cpp",
-    "testing/ArenaTestHelpers.h",
     "testing/TreeTestHelpers.cpp",
     "testing/TreeTestHelpers.h",
     "testing/RunAllTests.cpp",