[Mac/GN] Do not EXPORT_SYMBOLS in //media/base/simd unless is_component_build.

media/base/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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
@@ skipping 519 matching lines @@
       "simd/convert_rgb_to_yuv_ssse3.asm",
       "simd/convert_yuv_to_rgb_sse.asm",
       "simd/convert_yuva_to_argb_mmx.asm",
       "simd/empty_register_state_mmx.asm",
       "simd/linear_scale_yuv_to_rgb_mmx.asm",
       "simd/linear_scale_yuv_to_rgb_sse.asm",
       "simd/scale_yuv_to_rgb_mmx.asm",
       "simd/scale_yuv_to_rgb_sse.asm",
     ]
 
-    # TODO(ajwong): Only export if shared_library build...
     yasm_flags = [
       "-DCHROMIUM",
-      "-DEXPORT_SYMBOLS",
 
       # In addition to the same path as source asm, let yasm %include
       # search path be relative to src/ per Chromium policy.
       "-I",
       rebase_path("..", root_build_dir),
     ]
 
+    if (is_component_build) {
+      yasm_flags += [ "-DEXPORT_SYMBOLS" ]
+    }
+
     inputs = [
       "//third_party/x86inc/x86inc.asm",
       "simd/convert_rgb_to_yuv_ssse3.inc",
       "simd/convert_yuv_to_rgb_mmx.inc",
       "simd/convert_yuva_to_argb_mmx.inc",
       "simd/linear_scale_yuv_to_rgb_mmx.inc",
       "simd/media_export.asm",
       "simd/scale_yuv_to_rgb_mmx.inc",
     ]
 
@@ skipping 37 matching lines @@
 
 fuzzer_test("media_container_names_fuzzer") {
   sources = [
     "container_names_fuzzertest.cc",
   ]
   deps = [
     "//base",
     "//media",
   ]
 }