Add data reduction functionality to all platforms.

chrome/browser/android/intercept_download_resource_throttle.cc

Index: chrome/browser/android/intercept_download_resource_throttle.cc
diff --git a/chrome/browser/android/intercept_download_resource_throttle.cc b/chrome/browser/android/intercept_download_resource_throttle.cc
index 1101b1e9ebe211f02312e6dee8bb98c658552f65..04f8a2263757706ac7347d050c5c91aea10378b6 100644
--- a/chrome/browser/android/intercept_download_resource_throttle.cc
+++ b/chrome/browser/android/intercept_download_resource_throttle.cc
@@ -58,16 +58,13 @@ void InterceptDownloadResourceThrottle::ProcessDownloadRequest() {
   // exception is a request that is fetched via the Chrome Proxy and does not
   // authenticate with the origin.
   if (request_->response_info().did_use_http_auth) {
-#if defined(SPDY_PROXY_AUTH_ORIGIN)
     if (headers.HasHeader(net::HttpRequestHeaders::kAuthorization) ||
         !(request_->response_info().headers &&
             data_reduction_proxy::HasDataReductionProxyViaHeader(
                 request_->response_info().headers))) {
       return;
     }
-#else
-    return;
-#endif
+
   }
 
   // For OMA DRM downloads, Android Download Manager doesn't handle them