Remove several grab-bag includes from the v8.h header.

src/DEPS

 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",
   "-src/libplatform",
   "-include/libplatform"
 ]
 
 specific_include_rules = {
+  ".*\.h": [
+    # Note that src/v8.h is the top header for some .cc files, it shouldn't be
+    # included in any .h files though. In the long run we should make src/v8.h
+    # act like any normal header file, instead of a grab-bag include.
+    "-src/v8.h",
+  ],
   "d8\.cc": [
     "+include/libplatform/libplatform.h",
   ],
   # TODO(mstarzinger): Only needed because of Code::CodeIterateBody cyclicity.
   "objects\.cc": [
     "+src/heap/objects-visiting-inl.h",
   ],
 }