Use a direct include of utf_string_conversions.h in content/.

content/common/mac/attributed_string_coder_unittest.mm

 // 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.
 
 #include <AppKit/AppKit.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #import "content/common/mac/attributed_string_coder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 
 using mac::AttributedStringCoder;
 
 class AttributedStringCoderTest : public testing::Test {
  public:
   NSMutableAttributedString* NewAttrString() {
     NSString* str = @"The quick brown fox jumped over the lazy dog.";
@@ skipping 106 matching lines @@
   NSRange range;
   NSDictionary* attrs = [decoded attributesAtIndex:0 effectiveRange:&range];
   EXPECT_NSEQ([NSFont systemFontOfSize:12],
               [attrs objectForKey:NSFontAttributeName]);
   EXPECT_TRUE(NSEqualRanges(range, NSMakeRange(0, 5)));
 
   attrs = [decoded attributesAtIndex:5 effectiveRange:&range];
   EXPECT_FALSE([attrs objectForKey:NSFontAttributeName]);
   EXPECT_EQ(0U, [attrs count]);
 }