Revert "Create and pass shared-histogram-allocator from browser to renderer."

content/child/child_histogram_message_filter.cc

Index: content/child/child_histogram_message_filter.cc
diff --git a/content/child/child_histogram_message_filter.cc b/content/child/child_histogram_message_filter.cc
index d49e6d1d2bca8a733c0fa2f20093d8c786ad3335..f749cf812fb571c502af103b8068c53b71aeb271 100644
--- a/content/child/child_histogram_message_filter.cc
+++ b/content/child/child_histogram_message_filter.cc
@@ -9,7 +9,6 @@
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/metrics/histogram_delta_serialization.h"
-#include "base/metrics/persistent_histogram_allocator.h"
 #include "base/single_thread_task_runner.h"
 #include "content/child/child_process.h"
 #include "content/common/child_process_messages.h"
@@ -36,29 +35,13 @@ bool ChildHistogramMessageFilter::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ChildHistogramMessageFilter, message)
-    IPC_MESSAGE_HANDLER(ChildProcessMsg_SetHistogramMemory,
-                        OnSetHistogramMemory)
-    IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildNonPersistentHistogramData,
+    IPC_MESSAGE_HANDLER(ChildProcessMsg_GetChildHistogramData,
                         OnGetChildHistogramData)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
-void ChildHistogramMessageFilter::OnSetHistogramMemory(
-    const base::SharedMemoryHandle& memory_handle,
-    int memory_size) {
-  // This message must be received only once. Multiple calls to create a global
-  // allocator will cause a CHECK() failure.
-  base::GlobalHistogramAllocator::CreateWithSharedMemoryHandle(memory_handle,
-                                                               memory_size);
-
-  base::PersistentHistogramAllocator* global_allocator =
-      base::GlobalHistogramAllocator::Get();
-  if (global_allocator)
-    global_allocator->CreateTrackingHistograms(global_allocator->Name());
-}
-
 void ChildHistogramMessageFilter::SendHistograms(int sequence_number) {
   io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&ChildHistogramMessageFilter::UploadAllHistograms,