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

content/common/child_process_messages.h

Index: content/common/child_process_messages.h
diff --git a/content/common/child_process_messages.h b/content/common/child_process_messages.h
index fd5fac49351ed1859d8b71c9bc3229b4df0a6d70..78478cdecb9ae8c6ae15956c0d37a2036cfda447 100644
--- a/content/common/child_process_messages.h
+++ b/content/common/child_process_messages.h
@@ -102,16 +102,8 @@ IPC_MESSAGE_CONTROL2(ChildProcessMsg_GetChildProfilerData,
 IPC_MESSAGE_CONTROL1(ChildProcessMsg_ProfilingPhaseCompleted,
                      int /* profiling_phase */)
 
-// Sent to set the shared memory buffer to be used for storing histograms that
-// are to be reported by the browser process to UMA. The following message
-// (GetChildNonPersistentHistogramData) will return any histograms created
-// before this message is received but not any histograms created afterward.
-IPC_MESSAGE_CONTROL2(ChildProcessMsg_SetHistogramMemory,
-                     base::SharedMemoryHandle /* shm_handle */,
-                     int /* shm_size */)
-
 // Send to all the child processes to send back histogram data.
-IPC_MESSAGE_CONTROL1(ChildProcessMsg_GetChildNonPersistentHistogramData,
+IPC_MESSAGE_CONTROL1(ChildProcessMsg_GetChildHistogramData,
                      int /* sequence_number */)
 
 // Sent to child processes to tell them to enter or leave background mode.