Remove blink::WebLayerClient and WebGraphicsLayerDebugInfo.

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index ec882fe820a0c9e1cae20cce438e664914697a55..19e6cbc4d6310af64f6092b2e01925b2d7aba601 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -196,6 +196,8 @@ component("platform") {
   ]
 
   public_deps = [
+    "//base",
+    "//cc",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//skia",
     "//third_party:jpeg",
@@ -209,10 +211,10 @@ component("platform") {
   ]
   deps = [
     ":make_platform_generated",
+    "//third_party/WebKit/Source/platform/heap",
+    "//third_party/WebKit/Source/wtf",
     "//third_party/harfbuzz-ng",
     "//third_party/icu",
-    "//third_party/WebKit/Source/wtf",
-    "//third_party/WebKit/Source/platform/heap",
   ]
 
   if (is_mac) {
@@ -349,11 +351,11 @@ test("heap_unittests") {
     "//base",
     "//base/allocator",
     "//base/test:test_support",
+    "//content/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/wtf",
     "//third_party/WebKit/Source/wtf:test_support",
-    "//content/test:test_support",
   ]
   if (is_android) {
     apk_deps = [
@@ -400,9 +402,9 @@ test("platform_unittests") {
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
-    "//third_party/harfbuzz-ng",
     "//third_party/WebKit/Source/wtf",
     "//third_party/WebKit/Source/wtf:test_support",
+    "//third_party/harfbuzz-ng",
     "//url",
   ]