Make unit_tests pass with pt_BR.UTF-8 locale.

base/string_util.h

Index: base/string_util.h
diff --git a/base/string_util.h b/base/string_util.h
index d62e9b0a9b4b0bc2376cb63749b8f2ba184ce6c0..0a79c6f50cbe07ef3f77864d8a1db620c413a329 100644
--- a/base/string_util.h
+++ b/base/string_util.h
@@ -95,6 +95,23 @@ size_t wcslcpy(wchar_t* dst, const wchar_t* src, size_t dst_size);
 // This function is intended to be called from base::vswprintf.
 bool IsWprintfFormatPortable(const wchar_t* format);
 
+enum LocaleDependence {
+  LOCALE_DEPENDENT,
+  LOCALE_INDEPENDENT
+};
+
+std::string DoubleToString(double value, LocaleDependence locale_dependent);
+std::wstring DoubleToWString(double value, LocaleDependence locale_dependent);
+
+bool StringToDouble(const std::string& input, double* output,
+                    LocaleDependence locale_dependent);
+bool StringToDouble(const std::wstring& input, double* output,
+                    LocaleDependence locale_dependent);
+double StringToDouble(const std::string& value,
+                      LocaleDependence locale_dependent);
+double StringToDouble(const std::wstring& value,
+                      LocaleDependence locale_dependent);
+
 }  // namespace base
 
 #if defined(OS_WIN)
@@ -354,6 +371,7 @@ std::wstring Int64ToWString(int64 value);
 std::string Uint64ToString(uint64 value);
 std::wstring Uint64ToWString(uint64 value);
 
+
 // Perform a best-effort conversion of the input string to a numeric type,
 // setting |*output| to the result of the conversion.  Returns true for
 // "perfect" conversions; returns false in the following cases:
@@ -376,6 +394,8 @@ bool HexStringToInt(const std::wstring& input, int* output);
 // numbers in hexadecimal, and strings representing non-fininte values (such
 // as NaN and inf) is undefined.  Otherwise, these behave the same as the
 // integral variants above.
+//
+// By default, locale-dependent variant is used.
 bool StringToDouble(const std::string& input, double* output);
 bool StringToDouble(const std::wstring& input, double* output);
 
@@ -388,6 +408,7 @@ int64 StringToInt64(const std::string& value);
 int64 StringToInt64(const std::wstring& value);
 int HexStringToInt(const std::string& value);
 int HexStringToInt(const std::wstring& value);
+// By default, locale-dependent variant is used.
 double StringToDouble(const std::string& value);
 double StringToDouble(const std::wstring& value);