Move fdlibm in src/third_party.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 164 matching lines @@
   # changes.
   source_prereqs = [ "tools/jsmin.py" ]
 
   sources = [
     "src/runtime.js",
     "src/v8natives.js",
     "src/symbol.js",
     "src/array.js",
     "src/string.js",
     "src/uri.js",
-    "third_party/fdlibm/fdlibm.js",
+    "src/third_party/fdlibm/fdlibm.js",
     "src/math.js",
     "src/apinatives.js",
     "src/date.js",
     "src/regexp.js",
     "src/arraybuffer.js",
     "src/typedarray.js",
     "src/generator.js",
     "src/object-observe.js",
     "src/collection.js",
     "src/weak-collection.js",
@@ skipping 711 matching lines @@
     "src/v8threads.h",
     "src/variables.cc",
     "src/variables.h",
     "src/version.cc",
     "src/version.h",
     "src/vm-state-inl.h",
     "src/vm-state.h",
     "src/zone-inl.h",
     "src/zone.cc",
     "src/zone.h",
-    "third_party/fdlibm/fdlibm.cc",
-    "third_party/fdlibm/fdlibm.h",
+    "src/third_party/fdlibm/fdlibm.cc",
+    "src/third_party/fdlibm/fdlibm.h",
   ]
 
   if (v8_target_arch == "x86") {
     sources += [
       "src/ia32/assembler-ia32-inl.h",
       "src/ia32/assembler-ia32.cc",
       "src/ia32/assembler-ia32.h",
       "src/ia32/builtins-ia32.cc",
       "src/ia32/code-stubs-ia32.cc",
       "src/ia32/code-stubs-ia32.h",
@@ skipping 495 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }