Fix "unreachable code" warnings (MSVC warning 4702) in content/.

content/test/mock_webclipboard_impl.cc

 // Copyright 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 "content/test/mock_webclipboard_impl.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
@@ skipping 27 matching lines @@
     case FormatHTML:
       return !m_htmlText.is_null();
 
     case FormatSmartPaste:
       return m_writeSmartPaste;
 
     default:
       NOTREACHED();
       return false;
   }
-
-  switch (buffer) {
-    case BufferStandard:
-      break;
-    case BufferSelection:
-#if defined(OS_POSIX) && !defined(OS_MACOSX)
-      break;
-#endif
-    default:
-      NOTREACHED();
-      return false;
-  }
-
-  return true;
 }
 
 WebVector<WebString> MockWebClipboardImpl::readAvailableTypes(
     Buffer buffer,
     bool* containsFilenames) {
   *containsFilenames = false;
   std::vector<WebString> results;
   if (!m_plainText.string().empty()) {
     results.push_back(WebString("text/plain"));
   }
@@ skipping 128 matching lines @@
 
 void MockWebClipboardImpl::clear() {
   m_plainText = base::NullableString16();
   m_htmlText = base::NullableString16();
   m_image.reset();
   m_customData.clear();
   m_writeSmartPaste = false;
 }
 
 }  // namespace content