GN: Depend on actual v8, not a stub target

Source/platform/BUILD.gn

Index: Source/platform/BUILD.gn
diff --git a/Source/platform/BUILD.gn b/Source/platform/BUILD.gn
index ff51e4667e30b6008c1982a162bcec201c16c793..8d8fd44924c37ffa5049a9a14588bdd0c3e3978d 100644
--- a/Source/platform/BUILD.gn
+++ b/Source/platform/BUILD.gn
@@ -173,7 +173,6 @@ component("platform") {
     get_target_outputs(":color_data")
 
   configs += [
-    ":v8_stub_config",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:non_test_config",
   ]
@@ -206,9 +205,7 @@ component("platform") {
     "//third_party/WebKit/Source/platform/heap",
     "//url",
     #'blink_heap_asm_stubs',
-    # TODO(GYP) also remove v8_stub_config when this is added, and uncomment
-    # V8 in the forward statement below.
-    #"//v8",
+    "//v8",
   ]
 
   forward_dependent_configs_from = [
@@ -221,8 +218,7 @@ component("platform") {
     "//third_party/ots",
     "//third_party/qcms",
     "//url",
-    # TODO(GYP)
-    #"//v8",
+    "//v8",
   ]
 
   if (is_mac) {
@@ -459,9 +455,3 @@ if (cpu_arch == "arm") {
     deps = [ ":blink_common" ]
   }
 }
-
-# This config is a placeholder to set up the V8 include path while the V8 GN
-# build is being worked on.
-config("v8_stub_config") {
-  include_dirs = [ "//v8/include" ]
-}