Convert renderer JS memory usage reporting to use Mojo.

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index c9218057d0217d1f6f6589c46b272a6c6046c699..a52a545c12a2b6e2a294dbcc3db2ca30d20affe7 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -238,9 +238,6 @@ IPC_MESSAGE_CONTROL2(ChromeViewMsg_SetFieldTrialGroup,
                      std::string /* field trial name */,
                      std::string /* group name that was assigned. */)
 
-// Asks the renderer to send back V8 heap stats.
-IPC_MESSAGE_CONTROL0(ChromeViewMsg_GetV8HeapStats)
-
 IPC_MESSAGE_ROUTED1(ChromeViewMsg_SetPageSequenceNumber,
                     int /* page_seq_no */)
 
@@ -467,11 +464,6 @@ IPC_SYNC_MESSAGE_ROUTED2_1(ChromeViewHostMsg_GetSearchProviderInstallState,
                            GURL /* inquiry url */,
                            search_provider::InstallState /* install */)
 
-// Sends back stats about the V8 heap.
-IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_V8HeapStats,
-                     int /* size of heap (allocated from the OS) */,
-                     int /* bytes in use */)
-
 // Notifies when a plugin couldn't be loaded because it's outdated.
 IPC_MESSAGE_ROUTED2(ChromeViewHostMsg_BlockedOutdatedPlugin,
                     int /* placeholder ID */,