Convert FormatBytes to string16.

base/string_util.h

Index: base/string_util.h
diff --git a/base/string_util.h b/base/string_util.h
index c69b2de3354c07b21a7ad580fa84a776a8bd2e4d..4419b79dbb079c4fbad62a9c04544005f8612c52 100644
--- a/base/string_util.h
+++ b/base/string_util.h
@@ -417,16 +417,16 @@ DataUnits GetByteDisplayUnits(int64 bytes);
 // specified by 'units', with an optional unit suffix.
 // Ex: FormatBytes(512, DATA_UNITS_KIBIBYTE, true) => "0.5 KB"
 // Ex: FormatBytes(10*1024, DATA_UNITS_MEBIBYTE, false) => "0.1"
-std::wstring FormatBytes(int64 bytes, DataUnits units, bool show_units);
+string16 FormatBytes(int64 bytes, DataUnits units, bool show_units);
 
 // As above, but with "/s" units.
 // Ex: FormatSpeed(512, DATA_UNITS_KIBIBYTE, true) => "0.5 KB/s"
 // Ex: FormatSpeed(10*1024, DATA_UNITS_MEBIBYTE, false) => "0.1"
-std::wstring FormatSpeed(int64 bytes, DataUnits units, bool show_units);
+string16 FormatSpeed(int64 bytes, DataUnits units, bool show_units);
 
 // Return a number formated with separators in the user's locale way.
 // Ex: FormatNumber(1234567) => 1,234,567
-std::wstring FormatNumber(int64 number);
+string16 FormatNumber(int64 number);
 
 // Starting at |start_offset| (usually 0), replace the first instance of
 // |find_this| with |replace_with|.