clang/win: Let some chromium_code targets build with -Wextra.

sandbox/win/src/crosscall_params.h

 // Copyright (c) 2012 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.
 
 #ifndef SANDBOX_SRC_CROSSCALL_PARAMS_H__
 #define SANDBOX_SRC_CROSSCALL_PARAMS_H__
 
 #include <windows.h>
 #include <lmaccess.h>
 #include <stdint.h>
@@ skipping 96 matching lines @@
   // Returns the tag (ipc unique id) associated with this IPC.
   uint32_t GetTag() const { return tag_; }
 
   // Returns the beggining of the buffer where the IPC params can be stored.
   // prior to an IPC call
   const void* GetBuffer() const {
     return this;
   }
 
   // Returns how many parameter this IPC call should have.
-  const uint32_t GetParamsCount() const { return params_count_; }
+  uint32_t GetParamsCount() const { return params_count_; }
 
   // Returns a pointer to the CrossCallReturn structure.
   CrossCallReturn* GetCallReturn() {
     return &call_return;
   }
 
   // Returns TRUE if this call contains InOut parameters.
-  const bool IsInOut() const {
-    return (1 == is_in_out_);
-  }
+  bool IsInOut() const { return (1 == is_in_out_); }
 
   // Tells the CrossCall object if it contains InOut parameters.
   void SetIsInOut(bool value) {
     if (value)
       is_in_out_ = 1;
     else
       is_in_out_ = 0;
   }
 
  protected:
@@ skipping 141 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ActualCallParams);
 };
 
 static_assert(sizeof(ActualCallParams<1, 1024>) == 1024, "bad size buffer");
 static_assert(sizeof(ActualCallParams<2, 1024>) == 1024, "bad size buffer");
 static_assert(sizeof(ActualCallParams<3, 1024>) == 1024, "bad size buffer");
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_SRC_CROSSCALL_PARAMS_H__