Reland "Remove unnecessary include_dirs settings from BUILD.gn in Blink"

This is a reland of 7f4f1890
This CL has no differences from it.  http://crrev.com/559003 should
fix a build issue.

Original change's description:
> Remove unnecessary include_dirs settings from BUILD.gn in Blink
>
> Now we have no Blink-relative #includes.
>
> Bug: 836071
> Change-Id: I33bbab6340def20dcd07a72fcc5d1a4d08254a1b
> Reviewed-on: https://chromium-review.googlesource.com/1058876
> Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
> Commit-Queue: Kent Tamura <tkent@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#558629}

TBR=peria@chromium.org

Bug: 836071
Change-Id: I452a61199a31b6a6a617e2985331ab6a034c6c7c
Reviewed-on: https://chromium-review.googlesource.com/1059636Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559018}

third_party/blink/public/BUILD.gn

@@ -51,11 +51,6 @@ group("all_blink") {
 }
 
 config("blink_headers_config") {
-  include_dirs = [
-    "..",
-    "$root_gen_dir/third_party/blink",
-  ]
-
   # Allow :blink_headers to include v8.h without linking to it.
   configs = [ "//v8:external_config" ]
 }

third_party/blink/renderer/BUILD.gn

@@ -77,13 +77,6 @@ config("blink_pch") {
 # config -----------------------------------------------------------------------
 
 config("config") {
-  include_dirs = [
-    ".",
-    "..",
-    "$root_gen_dir/third_party/blink/renderer",
-    "$root_gen_dir/third_party/blink",
-  ]
-
   cflags = []
   defines = []
 

third_party/blink/renderer/core/BUILD.gn

@@ -41,10 +41,7 @@ config("config") {
 }
 
 config("core_include_dirs") {
-  include_dirs = [
-    "..",
-    "$root_gen_dir/third_party/blink/renderer",
-  ]
+  include_dirs = []
   if (is_android && use_openmax_dl_fft) {
     include_dirs += [ "//third_party/openmax_dl" ]
   }
@@ -1580,7 +1577,6 @@ target("jumbo_" + core_link_small_target_type, "core_generated") {
     ":core_include_dirs",
     "//tools/v8_context_snapshot:use_v8_context_snapshot",
   ]
-  include_dirs = [ "$root_gen_dir/third_party/blink/renderer" ]
 
   cflags = []
   defines = []

third_party/blink/renderer/modules/exported/BUILD.gn

@@ -44,6 +44,4 @@ static_library("test_support") {
     "//third_party/blink/renderer:config",
     "//third_party/blink/renderer/core:blink_core_pch",
   ]
-
-  include_dirs = [ "$root_gen_dir/third_party/blink/renderer" ]
 }

third_party/blink/renderer/platform/BUILD.gn

@@ -166,11 +166,6 @@ group("make_platform_generated") {
 import("//build/config/pch.gni")
 
 config("blink_platform_config") {
-  include_dirs = [
-    #"$angle_path/include",
-    "$root_gen_dir/third_party/blink/renderer",
-  ]
-
   configs = [
     "//third_party/blink/renderer:config",
     "//third_party/blink/renderer:inside_blink",
@@ -1976,8 +1971,6 @@ jumbo_source_set("blink_platform_unittests_sources") {
   ]
 
   defines = [ "INSIDE_BLINK" ]
-
-  include_dirs = [ "$root_gen_dir/third_party/blink/renderer" ]
 }
 
 executable("image_decode_bench") {