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

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 717ea25a87c9201e99268c72991d1ab9fe15fd9e..8ec68e87a6dcae2cf37c4233b17b4832f4ef5297 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -82,11 +82,7 @@ if (is_desktop_linux) {
 # require many files from it. This makes linking more efficient. However, on
 # Windows official builds the static library will be too large (> 32-bits) so
 # use source sets in that case.
-if (is_mac || (is_win && is_official_build)) {
-  # TODO(brettw) bug 618797: Remove the mac condition. On Mac making this
-  # target a static_library causes a crash on startup and the browser_tests all
-  # fail. My guess is this is due to a required static initializer not being
-  # brought in.
+if (is_win && is_official_build) {
   chrome_browser_target_type = "source_set"
 } else {
   chrome_browser_target_type = "static_library"