Collect data reduction proxy UMA on all platforms

components/data_reduction_proxy/browser/data_reduction_proxy_metrics.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_METRICS_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_METRICS_H_
 
 #include "base/time/time.h"
 
 namespace net {
@@ skipping 21 matching lines @@
     const net::URLRequest* request);
 
 // Returns |received_content_length| as adjusted original content length if
 // |original_content_length| has the invalid value (-1) or |request_type|
 // is not |VIA_DATA_REDUCTION_PROXY|.
 int64 GetAdjustedOriginalContentLength(
     DataReductionProxyRequestType request_type,
     int64 original_content_length,
     int64 received_content_length);
 
-#if defined(OS_ANDROID) || defined(OS_IOS)
-// TODO(bengr): Remove platform-specific ifdefs.
 // This is only exposed for testing. It is normally called by
 // UpdateContentLengthPrefs.
 void UpdateContentLengthPrefsForDataReductionProxy(
     int received_content_length,
     int original_content_length,
     bool with_data_reduction_proxy_enabled,
     DataReductionProxyRequestType request_type,
     base::Time now, PrefService* prefs);
-#endif
 
 // Records daily data savings statistics to prefs and reports data savings UMA.
 void UpdateContentLengthPrefs(
     int received_content_length,
     int original_content_length,
     bool with_data_reduction_proxy_enabled,
     DataReductionProxyRequestType request_type,
     PrefService* prefs);
 
 }  // namespace data_reduction_proxy
 
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_METRICS_H_