Update Mac plugin IME handling to match updated spec

chrome/common/plugin_messages_internal.h

Index: chrome/common/plugin_messages_internal.h
diff --git a/chrome/common/plugin_messages_internal.h b/chrome/common/plugin_messages_internal.h
index 31eca91424d1325bc13fba70eb3bdcd718f33e85..e87ee0bf33130320c40813e0c0e5fe1ec9ea5e4e 100644
--- a/chrome/common/plugin_messages_internal.h
+++ b/chrome/common/plugin_messages_internal.h
@@ -234,7 +234,7 @@ IPC_MESSAGE_ROUTED2(PluginMsg_WindowFrameChanged,
                     gfx::Rect /* window_frame */,
                     gfx::Rect /* view_frame */)
 
-IPC_MESSAGE_ROUTED1(PluginMsg_ImeCompositionConfirmed,
+IPC_MESSAGE_ROUTED1(PluginMsg_ImeCompositionCompleted,
                     string16 /* text */)
 #endif
 
@@ -403,8 +403,10 @@ IPC_MESSAGE_CONTROL0(PluginHostMsg_PluginShuttingDown)
 IPC_MESSAGE_ROUTED1(PluginHostMsg_UpdateGeometry_ACK,
                     int /* ack_key */)
 
-IPC_MESSAGE_ROUTED1(PluginHostMsg_SetImeEnabled,
-                    bool /* enabled */)
+IPC_MESSAGE_ROUTED1(PluginHostMsg_FocusChanged,
+                    bool /* focused */)
+
+IPC_MESSAGE_ROUTED0(PluginHostMsg_StartIme)
 
 // This message, used in Mac OS X 10.5 and earlier, is sent from the plug-in
 // process to the renderer process to indicate that the plug-in allocated a