clang/win: Fix most -Wunused-function warnings in Chromium code.

chrome/app/image_pre_reader_win.cc

 // 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.
 
 #include "chrome/app/image_pre_reader_win.h"
 
 #include <windows.h>
 #include <algorithm>
 #include <limits>
 #include <vector>
@@ skipping 10 matching lines @@
 // The minimum buffer size to allocate when reading the PE file headers.
 //
 // The PE file headers usually fit into a single 1KB page, and a PE file must
 // at least contain the initial page with the headers. That said, as long as
 // we expect at least sizeof(IMAGE_DOS_HEADER) bytes, we're ok.
 const size_t kMinHeaderBufferSize = 0x400;
 
 // A handy symbolic constant.
 const size_t kOneHundredPercent = 100;
 
-void StaticAssertions() {
-  COMPILE_ASSERT(kMinHeaderBufferSize >= sizeof(IMAGE_DOS_HEADER),
-                 min_header_buffer_size_at_least_as_big_as_the_dos_header);
-}
+static_assert(kMinHeaderBufferSize >= sizeof(IMAGE_DOS_HEADER),
+              "kMinHeaderBufferSize must be at least as big as the dos header");
 
 // This struct provides a deallocation functor for use with scoped_ptr<T>
 // allocated with ::VirtualAlloc().
 struct VirtualFreeDeleter {
   void operator() (void* ptr) {
     ::VirtualFree(ptr, 0, MEM_RELEASE);
   }
 };
 
 // A wrapper for the Win32 ::SetFilePointer() function with some error checking.
@@ skipping 367 matching lines @@
     // Vista+ branch. On these OSes, we warm up the Image by reading its
     // file off the disk.
     return PartialPreReadImageOnDisk(file_path, percentage, max_chunk_size);
   }
 
   // WinXP branch. For XP, reading the image from disk doesn't do what we want
   // so instead we pull the pages into memory by loading the DLL and touching
   // initialized pages at a stride.
   return PartialPreReadImageInMemory(file_path, percentage);
 }