[Mac Fix-It] removed base::mac::AmIForeground function.

base/mac/mac_util.h

Index: base/mac/mac_util.h
diff --git a/base/mac/mac_util.h b/base/mac/mac_util.h
index d0173c03cdc941b9352df0f2453491b54c2f823c..d87aa8a07e61d7a0c90975de03383f0cf0608caf 100644
--- a/base/mac/mac_util.h
+++ b/base/mac/mac_util.h
@@ -65,11 +65,6 @@ BASE_EXPORT void ReleaseFullScreen(FullScreenMode mode);
 BASE_EXPORT void SwitchFullScreenModes(FullScreenMode from_mode,
                                        FullScreenMode to_mode);
 
-// Returns true if this process is in the foreground, meaning that it's the
-// frontmost process, the one whose menu bar is shown at the top of the main
-// display.
-BASE_EXPORT bool AmIForeground();
-
 // Excludes the file given by |file_path| from being backed up by Time Machine.
 BASE_EXPORT bool SetFileBackupExclusion(const FilePath& file_path);