Remove wchar_t versions of StringPrintf from Android

base/stringprintf.h

Index: base/stringprintf.h
diff --git a/base/stringprintf.h b/base/stringprintf.h
index 40ad107aead14fd3af62aeafb63f6aae21ac861a..60fbad5c83da684313aad166c7a1233a68770727 100644
--- a/base/stringprintf.h
+++ b/base/stringprintf.h
@@ -17,8 +17,11 @@ namespace base {
 // Return a C++ string given printf-like input.
 BASE_EXPORT std::string StringPrintf(const char* format, ...)
     PRINTF_FORMAT(1, 2);
+// OS_ANDROID's libc does not support wchar_t, so several overloads are omitted.
+#if !defined(OS_ANDROID)
 BASE_EXPORT std::wstring StringPrintf(const wchar_t* format, ...)
     WPRINTF_FORMAT(1, 2);
+#endif
 
 // Return a C++ string given vprintf-like input.
 BASE_EXPORT std::string StringPrintV(const char* format, va_list ap)
@@ -28,25 +31,31 @@ BASE_EXPORT std::string StringPrintV(const char* format, va_list ap)
 BASE_EXPORT const std::string& SStringPrintf(std::string* dst,
                                              const char* format, ...)
     PRINTF_FORMAT(2, 3);
+#if !defined(OS_ANDROID)
 BASE_EXPORT const std::wstring& SStringPrintf(std::wstring* dst,
                                               const wchar_t* format, ...)
     WPRINTF_FORMAT(2, 3);
+#endif
 
 // Append result to a supplied string.
 BASE_EXPORT void StringAppendF(std::string* dst, const char* format, ...)
     PRINTF_FORMAT(2, 3);
+#if !defined(OS_ANDROID)
 // TODO(evanm): this is only used in a few places in the code;
 // replace with string16 version.
 BASE_EXPORT void StringAppendF(std::wstring* dst, const wchar_t* format, ...)
     WPRINTF_FORMAT(2, 3);
+#endif
 
 // Lower-level routine that takes a va_list and appends to a specified
 // string.  All other routines are just convenience wrappers around it.
 BASE_EXPORT void StringAppendV(std::string* dst, const char* format, va_list ap)
     PRINTF_FORMAT(2, 0);
+#if !defined(OS_ANDROID)
 BASE_EXPORT void StringAppendV(std::wstring* dst,
                                const wchar_t* format, va_list ap)
     WPRINTF_FORMAT(2, 0);
+#endif
 
 }  // namespace base