Disable getting histogram data from child processes.

base/metrics/histogram_snapshot_manager.cc

Index: base/metrics/histogram_snapshot_manager.cc
===================================================================
--- base/metrics/histogram_snapshot_manager.cc	(revision 150944)
+++ base/metrics/histogram_snapshot_manager.cc	(working copy)
@@ -4,7 +4,10 @@
 
 #include "base/metrics/histogram_snapshot_manager.h"
 
+#include "base/compiler_specific.h"
+#include "base/debug/alias.h"
 #include "base/metrics/statistics_recorder.h"
+#include "base/string_util.h"
 
 using base::Histogram;
 using base::StatisticsRecorder;
@@ -44,6 +47,12 @@
 
   int corruption = histogram.FindCorruption(snapshot);
 
+  char histogram_name_buf[128];
+  base::strlcpy(histogram_name_buf,
+                histogram_name.c_str(),
+                arraysize(histogram_name_buf));
+  base::debug::Alias(histogram_name_buf);
+
   // Crash if we detect that our histograms have been overwritten.  This may be
   // a fair distance from the memory smasher, but we hope to correlate these
   // crashes with other events, such as plugins, or usage patterns, etc.