base: Move SplitStringDontTrim functions from string_util.h to string_split.h

base/string_split.h

Index: base/string_split.h
diff --git a/base/string_split.h b/base/string_split.h
index 4ded704692eb05a9bb5d32e0dfe3490a3dfc3b79..d47337cb059770dc897fd37c20564c680fbca994 100644
--- a/base/string_split.h
+++ b/base/string_split.h
@@ -33,6 +33,25 @@ void SplitStringUsingSubstr(const std::string& str,
                             const std::string& s,
                             std::vector<std::string>* r);
 
+// The same as SplitString, but don't trim white space.
+// Where wchar_t is char16 (i.e. Windows), |c| must be in BMP
+// (Basic Multilingual Plane). Elsewhere (Linux/Mac), wchar_t
+// should be a valid Unicode code point (32-bit).
+void SplitStringDontTrim(const std::wstring& str,
+                         wchar_t c,
+                         std::vector<std::wstring>* r);
+// NOTE: |c| must be in BMP (Basic Multilingual Plane)
+void SplitStringDontTrim(const string16& str,
+                         char16 c,
+                         std::vector<string16>* r);
+// |str| should not be in a multi-byte encoding like Shift-JIS or GBK in which
+// the trailing byte of a multi-byte character can be in the ASCII range.
+// UTF-8, and other single/multi-byte ASCII-compatible encodings are OK.
+// Note: |c| must be in the ASCII range.
+void SplitStringDontTrim(const std::string& str,
+                         char c,
+                         std::vector<std::string>* r);
+
 }  // namespace base
 
 #endif  // BASE_STRING_SPLIT_H