Revert of Collect data reduction proxy UMA on all platforms

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index 1cab93d7654e4ff593935ab698e2120572b86330..b580265ad493e6a2102dcc5d5bac279574a9ac03 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -275,6 +275,7 @@
     int64 received_content_length,
     int64 original_content_length,
     const base::TimeDelta& freshness_lifetime) {
+#if defined(OS_ANDROID)
   // Add the current resource to these histograms only when a valid
   // X-Original-Content-Length header is present.
   if (original_content_length >= 0) {
@@ -312,6 +313,7 @@
     return;
   UMA_HISTOGRAM_COUNTS("Net.HttpContentLengthCacheable24Hours",
                        received_content_length);
+#endif  // defined(OS_ANDROID)
 }
 
 #if defined(OS_ANDROID)