Revert r12998 - it broke some media/mime-related layout tests.

base/string_split.cc

Index: base/string_split.cc
diff --git a/base/string_split.cc b/base/string_split.cc
index ea694d5ab1d423765fab32c146ff9634328706c5..cdf708ba5116dab6dfc0f6a29ad14de3c3513f5f 100644
--- a/base/string_split.cc
+++ b/base/string_split.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -17,16 +17,19 @@ static void SplitStringT(const STR& str,
                          bool trim_whitespace,
                          std::vector<STR>* r) {
   size_t last = 0;
+  size_t i;
   size_t c = str.size();
-  for (size_t i = 0; i <= c; ++i) {
+  for (i = 0; i <= c; ++i) {
     if (i == c || str[i] == s) {
-      STR tmp(str, last, i - last);
-      if (trim_whitespace)
-        TrimWhitespace(tmp, TRIM_ALL, &tmp);
-      // Avoid converting an empty or all-whitespace source string into a vector
-      // of one empty string.
-      if (i != c || !r->empty() || !tmp.empty())
+      size_t len = i - last;
+      STR tmp = str.substr(last, len);
+      if (trim_whitespace) {
+        STR t_tmp;
+        TrimWhitespace(tmp, TRIM_ALL, &t_tmp);
+        r->push_back(t_tmp);
+      } else {
         r->push_back(tmp);
+      }
       last = i + 1;
     }
   }