cppgc: Fix build dependencies

- cppgc_headers: Do not depend on any internals but merely expose the
  public API interface.
- v8_libbase: Do not depend on v8_headers but merely on
  v8_config_headers as src/base should be independent of general V8.

Bug: chromium:1056170
Change-Id: I06d1a4ea20f243bae8e994deba9d76f07993ed4a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2720303
Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73060}

BUILD.gn

@@ -4403,7 +4403,7 @@ v8_component("v8_libbase") {
 
   public_configs = [ ":libbase_config" ]
 
-  deps = [ ":v8_headers" ]
+  deps = [ ":v8_config_headers" ]
 
   data = []
 
@@ -4685,21 +4685,6 @@ v8_header_set("cppgc_headers") {
     ":cppgc_header_features",
   ]
 
-  sources = [
-    "include/cppgc/garbage-collected.h",
-    "include/cppgc/member.h",
-    "include/cppgc/persistent.h",
-    "include/cppgc/type-traits.h",
-    "include/cppgc/visitor.h",
-  ]
-
-  deps = [ ":cppgc_base" ]
-  public_deps = [ ":v8_headers" ]
-}
-
-v8_source_set("cppgc_base") {
-  visibility = [ ":*" ]
-
   sources = [
     "include/cppgc/allocation.h",
     "include/cppgc/common.h",
@@ -4735,6 +4720,15 @@ v8_source_set("cppgc_base") {
     "include/cppgc/trace-trait.h",
     "include/cppgc/type-traits.h",
     "include/cppgc/visitor.h",
+  ]
+
+  public_deps = [ ":v8_config_headers" ]
+}
+
+v8_source_set("cppgc_base") {
+  visibility = [ ":*" ]
+
+  sources = [
     "src/heap/cppgc/allocation.cc",
     "src/heap/cppgc/compaction-worklists.cc",
     "src/heap/cppgc/compaction-worklists.h",
@@ -4838,7 +4832,7 @@ v8_source_set("cppgc_base") {
   ]
 
   public_deps = [
-    ":v8_config_headers",
+    ":cppgc_headers",
     ":v8_cppgc_shared",
     ":v8_libbase",
     ":v8_libplatform",