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

media/base/BUILD.gn

Index: media/base/BUILD.gn
diff --git a/media/base/BUILD.gn b/media/base/BUILD.gn
index 4b1cd13ce440e6d89bc932352b4940ee6155ee1a..458d4ff6c96a67ea3675532c18b322b84fa8a9b9 100644
--- a/media/base/BUILD.gn
+++ b/media/base/BUILD.gn
@@ -537,10 +537,8 @@ if (current_cpu == "x86" || current_cpu == "x64") {
       "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.
@@ -548,6 +546,10 @@ if (current_cpu == "x86" || current_cpu == "x64") {
       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",