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

base/string_util_unittest.cc

Index: base/string_util_unittest.cc
diff --git a/base/string_util_unittest.cc b/base/string_util_unittest.cc
index 23b1f53d21c01be56378a0c15ebdb8d644dac7f4..c4fd5ae9c77f480b176fb09b76eaa2e8fa6335a9 100644
--- a/base/string_util_unittest.cc
+++ b/base/string_util_unittest.cc
@@ -762,25 +762,11 @@ TEST(StringUtilTest, SplitString) {
   EXPECT_EQ(r[3], L"");
   r.clear();
 
-  SplitStringDontTrim(L"\t\ta\t", L'\t', &r);
-  ASSERT_EQ(4U, r.size());
-  EXPECT_EQ(r[0], L"");
-  EXPECT_EQ(r[1], L"");
-  EXPECT_EQ(r[2], L"a");
-  EXPECT_EQ(r[3], L"");
-  r.clear();
-
   SplitString(L"\ta\t\nb\tcc", L'\n', &r);
   ASSERT_EQ(2U, r.size());
   EXPECT_EQ(r[0], L"a");
   EXPECT_EQ(r[1], L"b\tcc");
   r.clear();
-
-  SplitStringDontTrim(L"\ta\t\nb\tcc", L'\n', &r);
-  ASSERT_EQ(2U, r.size());
-  EXPECT_EQ(r[0], L"\ta\t");
-  EXPECT_EQ(r[1], L"b\tcc");
-  r.clear();
 }
 
 // Test for Tokenize