Split ios/chrome/app/startup targets to reduce dependencies.

ios/chrome/browser/BUILD.gn

Index: ios/chrome/browser/BUILD.gn
diff --git a/ios/chrome/browser/BUILD.gn b/ios/chrome/browser/BUILD.gn
index 7e026166fa35672f3533ed54a5b2d7ed0f7bd8e9..5a414acff5c550463e029d378c4b4a7ce705f76e 100644
--- a/ios/chrome/browser/BUILD.gn
+++ b/ios/chrome/browser/BUILD.gn
@@ -21,6 +21,20 @@ declare_args() {
   google_test_sync_url = ""
 }
 
+source_set("chrome_paths") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  sources = [
+    "chrome_paths.h",
+    "chrome_paths.mm",
+    "chrome_paths_internal.h",
+  ]
+
+  deps = [
+    "//base",
+    "//components/gcm_driver",
+  ]
+}
+
 source_set("browser") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
@@ -38,9 +52,6 @@ source_set("browser") {
     "chrome_constants.h",
     "chrome_coordinator.h",
     "chrome_coordinator.mm",
-    "chrome_paths.h",
-    "chrome_paths.mm",
-    "chrome_paths_internal.h",
     "chrome_switches.cc",
     "chrome_switches.h",
     "chrome_url_constants.cc",
@@ -78,6 +89,11 @@ source_set("browser") {
     "xcallback_parameters.h",
     "xcallback_parameters.mm",
   ]
+
+  public_deps = [

[sdefresne, 2017/02/01 14:01:02]

nit: can you put public_deps after deps (and without blank lines for consistency
with the rest of the BUILD.gn files in //ios)?

[marq (ping after 24h), 2017/05/03 15:27:27]

Done.

+    ":chrome_paths",
+  ]
+
   deps = [
     ":google_api_keys_header",
     ":settings_resources",
@@ -87,7 +103,6 @@ source_set("browser") {
     "//components/dom_distiller/core",
     "//components/flags_ui",
     "//components/flags_ui:switches",
-    "//components/gcm_driver",
     "//components/handoff",
     "//components/keyed_service/core",
     "//components/keyed_service/ios",