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 d311660ad13d4cc6a93c1eba700ee8fd2d19a94b..afc986f074306eae9cde736524375bbae801bb28 100644
--- a/content/browser/browser_child_process_host_impl.cc
+++ b/content/browser/browser_child_process_host_impl.cc
@@ -472,32 +472,32 @@ 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;