[heap] Avoid overzealous inclusion of heap internal headers.

src/DEPS

Index: src/DEPS
diff --git a/src/DEPS b/src/DEPS
index 94d6ec68e00fabd9936a92f60afd454368af7118..80dab6ba70c6b915b121d9e3950cdb29cf8e27f7 100644
--- a/src/DEPS
+++ b/src/DEPS
@@ -2,6 +2,9 @@ include_rules = [
   "+src",
   "-src/compiler",
   "+src/compiler/pipeline.h",
+  "-src/heap",
+  "+src/heap/heap.h",
+  "+src/heap/heap-inl.h",
   "-src/interpreter",
   "+src/interpreter/bytecodes.h",
   "+src/interpreter/interpreter.h",
@@ -13,4 +16,13 @@ specific_include_rules = {
   "d8\.cc": [
     "+include/libplatform/libplatform.h",
   ],
+  # TODO(mstarzinger): Get rid of grab-bag includes from heap in v8.h soon.
+  "v8\.h": [
+    "+src/heap/spaces-inl.h",
+    "+src/heap/incremental-marking-inl.h",
+  ],
+  # TODO(mstarzinger): Only needed because of Code::CodeIterateBody cyclicity.
+  "objects\.cc": [
+    "+src/heap/objects-visiting-inl.h",
+  ],
 }