Revert of Make chrome/browser and .../ui static libraries.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index fe59bcdfdb7e38b9c966af078ff163af8271bae7..388532475c91952f7f5beda1a2527b648d08679e 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -78,17 +78,7 @@
   }
 }
 
-# Use a static library here because many test binaries depend on this but don't
-# require many files from it. This makes linking more efficient.
-if (is_mac) {
-  # TODO(brettw) bug 618797: 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.
-  chrome_browser_target_type = "source_set"
-} else {
-  chrome_browser_target_type = "static_library"
-}
-target(chrome_browser_target_type, "browser") {
+source_set("browser") {
   configs += [
     "//build/config/compiler:wexit_time_destructors",
     "//build/config:precompiled_headers",