Update uses of UTF conversions in content/ to use the base:: namespace.

content/renderer/render_view_impl_unittest.cc

 // Copyright (c) 2013 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 "base/strings/utf_string_conversions.h"
 #include "content/public/common/context_menu_params.h"
 #include "content/renderer/render_view_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/range/range.h"
 
@@ skipping 10 matching lines @@
     { "test", 0, gfx::Range(0, 4), "test", false },
     { "zebestest", 0, gfx::Range(2, 6), "best", false },
     { "zebestest", 2, gfx::Range(2, 6), "best", true },
     { "test", 0, gfx::Range(0, 4), "hello", true },
     { "best test", 0, gfx::Range(0, 4), "best ", false },
     { "best test", 0, gfx::Range(0, 5), "best", false },
   };
 
   ContextMenuParams params;
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
-    params.selection_text = UTF8ToUTF16(cases[i].params_selection_text);
+    params.selection_text = base::UTF8ToUTF16(cases[i].params_selection_text);
     EXPECT_EQ(cases[i].expected_result,
               RenderViewImpl::ShouldUpdateSelectionTextFromContextMenuParams(
-                  UTF8ToUTF16(cases[i].selection_text),
+                  base::UTF8ToUTF16(cases[i].selection_text),
                   cases[i].selection_text_offset,
                   cases[i].selection_range,
                   params));
   }
 }
 
 }  // namespace content