Chromecast: unbundle ICU data file from the binary build.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index f67961a1ecc65f0f4af284a24e8f460095658533..83a3df61a14b7a282dbc5af352c47e6fbfef0d9e 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -967,10 +967,10 @@
         }],
 
         # By default, use ICU data file (icudtl.dat) on all platforms
-        # except when building Android WebView or Chromecast.
+        # except when building Android WebView.
         # TODO(jshin): Handle 'use_system_icu' on Linux (Chromium).
         # Set the data reduction proxy origin for Android Webview.
-        ['android_webview_build==0 and android_webview_telemetry_build==0 and chromecast==0', {
+        ['android_webview_build==0 and android_webview_telemetry_build==0', {
           'icu_use_data_file_flag%' : 1,
         }, {
           'icu_use_data_file_flag%' : 0,