[Mac/GN] Let //chrome/browser:browser be a static library.

build/config/mac/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/sysroot.gni")
 import("//build/config/mac/mac_sdk.gni")
 import("//build/config/mac/symbols.gni")
 
 # This is included by reference in the //build/config/compiler config that
 # is applied to all targets. It is here to separate out the logic.
@@ skipping 50 matching lines @@
     "-mmacosx-version-min=$mac_deployment_target",
   ]
 
   asmflags = common_flags
   cflags = common_flags
   ldflags = common_flags
 }
 
 # On Mac, this is used for everything except static libraries.
 config("mac_dynamic_flags") {
-  ldflags = []
+  ldflags = [ "-Wl,-ObjC" ]  # Always load Objective-C categories and classes.
 
   if (is_component_build) {
     ldflags += [
       # Path for loading shared libraries for unbundled binaries.
       "-Wl,-rpath,@loader_path/.",
 
       # Path for loading shared libraries for bundled binaries. Get back from
       # Binary.app/Contents/MacOS.
       "-Wl,-rpath,@loader_path/../../..",
     ]
@@ skipping 10 matching lines @@
 # //build/toolchain/mac/linker_driver.py.
 # Remove this config if a target wishes to change the arguments passed to the
 # strip command during linking. This config by default strips all symbols
 # from a binary, but some targets may wish to specify a saves file to preserve
 # specific symbols.
 config("strip_all") {
   if (enable_stripping) {
     ldflags = [ "-Wcrl,strip,-x,-S" ]
   }
 }