Generate the icu data binaries at compile time instead of checking in binaries

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 4e8e540349bd175ff37b22ce15d71c3ba66a8067..cccce992a0060eff7aa4e7124237a0be3cee25bd 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -492,65 +492,8 @@ component("icuuc") {
   }
 }
 
-# TODO(GYP) support use_system_icu.
-if (icu_use_data_file) {
-  if (is_ios) {
-    # TODO(GYP): Support mac resource bundle shown below.
-    # 'link_settings': {
-    #   'mac_bundle_resources': [
-    #     'source/data/in/icudtl.dat',
-    #   ],
-    # }
-  } else {
-    copy("icudata") {
-      if (is_android) {
-        sources = [
-          "android/icudtl.dat",
-        ]
-      } else {
-        sources = [
-          "source/data/in/icudtl.dat",
-        ]
-      }
-
-      outputs = [
-        "$root_out_dir/icudtl.dat",
-      ]
-    }
-  }
-} else {
-  if (is_win) {
-    # On Windows the target DLL is pre-built so just use a copy rule.
-    copy("icudata") {
-      sources = [
-        "windows/icudt.dll",
-      ]
-      outputs = [
-        "$root_out_dir/icudt.dll",
-      ]
-    }
-  } else {
-    source_set("icudata") {
-      # These are hand-generated, but will do for now.
-      #
-      # TODO(GYP): Gyp has considerations here for QNX and for the host toolchain
-      #  that have not been ported over.
-      if (is_linux) {
-        sources = [
-          "linux/icudtl_dat.S",
-        ]
-      } else if (is_mac) {
-        sources = [
-          "mac/icudtl_dat.S",
-        ]
-      } else if (is_android) {
-        sources = [
-          "android/icudtl_dat.S",
-        ]
-      } else {
-        assert(false, "No icu data for this platform")
-      }
-      defines = [ "U_HIDE_DATA_SYMBOL" ]
-    }
-  }
+group("icudata") {
+    deps = [
+        "gn_data_build_system:icu_data"
+    ]
 }