Fix BUILD.gn

TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/442343003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22937 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

BUILD.gn

@@ -866,8 +866,8 @@ source_set("v8_base") {
     "src/zone-inl.h",
     "src/zone.cc",
     "src/zone.h",
-    "third_party/fdlibm/fdlibm.cc',
-    "third_party/fdlibm/fdlibm.h',
+    "third_party/fdlibm/fdlibm.cc",
+    "third_party/fdlibm/fdlibm.h",
   ]
 
   if (v8_target_arch == "x86") {