Adjust memory sizes of persistent histogram allocations.

content/browser/browser_child_process_host_impl.cc

Index: content/browser/browser_child_process_host_impl.cc
diff --git a/content/browser/browser_child_process_host_impl.cc b/content/browser/browser_child_process_host_impl.cc
index c9111f13740a04879e5b31dc49c85300bcee7c1c..5b5c7d8e0142af2c278bf569fef2b0d4012c93cd 100644
--- a/content/browser/browser_child_process_host_impl.cc
+++ b/content/browser/browser_child_process_host_impl.cc
@@ -480,32 +480,32 @@ void BrowserChildProcessHostImpl::CreateMetricsAllocator() {
   base::StringPiece metrics_name;
   switch (data_.process_type) {
     case PROCESS_TYPE_UTILITY:
-      memory_size = 100 << 10;  // 100 KiB
+      memory_size = 64 << 10;  // 64 KiB
       metrics_name = "UtilityMetrics";
       break;
 
     case PROCESS_TYPE_ZYGOTE:
-      memory_size = 100 << 10;  // 100 KiB
+      memory_size = 64 << 10;  // 64 KiB
       metrics_name = "ZygoteMetrics";
       break;
 
     case PROCESS_TYPE_SANDBOX_HELPER:
-      memory_size = 100 << 10;  // 100 KiB
+      memory_size = 64 << 10;  // 64 KiB
       metrics_name = "SandboxHelperMetrics";
       break;
 
     case PROCESS_TYPE_GPU:
-      memory_size = 100 << 10;  // 100 KiB
+      memory_size = 64 << 10;  // 64 KiB
       metrics_name = "GpuMetrics";
       break;
 
     case PROCESS_TYPE_PPAPI_PLUGIN:
-      memory_size = 100 << 10;  // 100 KiB
+      memory_size = 64 << 10;  // 64 KiB
       metrics_name = "PpapiPluginMetrics";
       break;
 
     case PROCESS_TYPE_PPAPI_BROKER:
-      memory_size = 100 << 10;  // 100 KiB
+      memory_size = 64 << 10;  // 64 KiB
       metrics_name = "PpapiBrokerMetrics";
       break;