Fix GN win build.

base/allocator/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/allocator.gni")
 
 # Only executables and not libraries should depend on the allocator target;
 # only the application (the final executable) knows what allocator makes sense.
 # This "allocator" meta-target will forward to the default allocator according
 # to the build settings.
@@ skipping 16 matching lines @@
       "$tcmalloc_dir/src/config_linux.h",
       "$tcmalloc_dir/src/config_win.h",
 
       # tcmalloc native and forked files.
       "$tcmalloc_dir/src/base/abort.cc",
       "$tcmalloc_dir/src/base/abort.h",
       "$tcmalloc_dir/src/base/arm_instruction_set_select.h",
       # We don't list dynamic_annotations.c since its copy is already
       # present in the dynamic_annotations target.
       "$tcmalloc_dir/src/base/elf_mem_image.cc",
+      "$tcmalloc_dir/src/base/elf_mem_image.h",
       "$tcmalloc_dir/src/base/linuxthreads.cc",
       "$tcmalloc_dir/src/base/linuxthreads.h",
       "$tcmalloc_dir/src/base/logging.cc",
       "$tcmalloc_dir/src/base/logging.h",
       "$tcmalloc_dir/src/base/low_level_alloc.cc",
       "$tcmalloc_dir/src/base/low_level_alloc.h",
       "$tcmalloc_dir/src/base/spinlock.cc",
       "$tcmalloc_dir/src/base/spinlock.h",
       "$tcmalloc_dir/src/base/spinlock_internal.cc",
       "$tcmalloc_dir/src/base/spinlock_internal.h",
@@ skipping 96 matching lines @@
 
         # cpuprofiler
         "$tcmalloc_dir/src/base/thread_lister.c",
         "$tcmalloc_dir/src/base/thread_lister.h",
         "$tcmalloc_dir/src/profiledata.cc",
         "$tcmalloc_dir/src/profiledata.h",
         "$tcmalloc_dir/src/profile-handler.cc",
         "$tcmalloc_dir/src/profile-handler.h",
         "$tcmalloc_dir/src/profiler.cc",
       ]
-      defines = [ "PERFTOOLS_DLL_DECL=" ]
+      defines += [ "PERFTOOLS_DLL_DECL=" ]
     }
     if (is_linux || is_android) {
       sources -= [
         "$tcmalloc_dir/src/system-alloc.h",
         "$tcmalloc_dir/src/windows/port.cc",
         "$tcmalloc_dir/src/windows/port.h",
 
         # TODO(willchan): Support allocator shim later on.
         "allocator_shim.cc",
       ]
@@ skipping 36 matching lines @@
   }
 }  # !is_android
 
 source_set("allocator_extension_thunks") {
   visibility = "//base/*"
   sources = [
     "allocator_extension_thunks.cc",
     "allocator_extension_thunks.h",
   ]
 }