Previously we didn't pre-read at all if there was any configuration in the Ch...

chrome/app/client_util.cc

 // Copyright (c) 2006-2008 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 <windows.h>
 #include <shlwapi.h>
 
 #include "chrome/app/breakpad_win.h"
 #include "chrome/app/client_util.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 99 matching lines @@
   // Experimental pre-reading optimization
   // The idea is to pre read significant portion of chrome.dll in advance
   // so that subsequent hard page faults are avoided.
   DWORD pre_read_size_mb = 0;
   if (!cmd_line.HasSwitch(switches::kProcessType) &&
       (IsRunningHeadless() || InstallUtil::IsChromeFrameProcess())) {
     HKEY key = NULL;
     if (::RegOpenKeyEx(HKEY_CURRENT_USER, L"Software\\Google\\ChromeFrame",
                        0, KEY_QUERY_VALUE, &key) == ERROR_SUCCESS) {
       DWORD unused = sizeof(pre_read_size_mb);
-      RegQueryValueEx(key, L"PreRead", NULL, NULL,
-                      reinterpret_cast<LPBYTE>(&pre_read_size_mb), &unused);
+      if (::RegQueryValueEx(key, L"PreRead", NULL, NULL,
+                            reinterpret_cast<LPBYTE>(&pre_read_size_mb),
+                            &unused) != ERROR_SUCCESS) {
+        pre_read_size_mb = 16; // Default
+      }
       RegCloseKey(key);
       key = NULL;
     } else {
       pre_read_size_mb = 16; // Read in first 16 MB by default.
     }
   }
 
   if (pre_read_size_mb) {
     HANDLE chrome_dll = CreateFile(dir->c_str(),
                                        GENERIC_READ,
@@ skipping 176 matching lines @@
   }
 };
 
 MainDllLoader* MakeMainDllLoader() {
 #if defined(GOOGLE_CHROME_BUILD)
   return new ChromeDllLoader();
 #else
   return new ChromiumDllLoader();
 #endif
 }