Histograms - Support histograms for Plugins, GPU

chrome/common/chrome_constants.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.
 
 // A handful of resource-like constants related to the Chrome application.
 
 #ifndef CHROME_COMMON_CHROME_CONSTANTS_H_
 #define CHROME_COMMON_CHROME_CONSTANTS_H_
 #pragma once
 
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 #if defined(OS_CHROMEOS)
 extern const FilePath::CharType kGDataCacheDirname[];
 #endif  // defined(OS_CHROMEOS)
 
 // File name of the Pepper Flash plugin on different platforms.
 extern const FilePath::CharType kPepperFlashPluginFilename[];
 
 extern const bool kRecordModeEnabled;
 
-// Most sequence numbers are used by a renderer when responding to a browser
-// request for histogram data.  This reserved number is used when a renderer
-// sends an unprovoked update, such as after a page has been loaded.  Using
-// this reserved constant avoids any chance of confusion with a response having
-// a browser-supplied sequence number.
-extern const int kHistogramSynchronizerReservedSequenceNumber;
-
 // The language code used when the language of a page could not be detected.
 // (Matches what the CLD -Compact Language Detection- library reports.)
 extern const char* const kUnknownLanguageCode;
 
 // If another javascript message box is displayed within
 // kJavascriptMessageExpectedDelay of a previous javascript message box being
 // dismissed, display an option to suppress future message boxes from this
 // contents.
 extern const int kJavascriptMessageExpectedDelay;
 
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 extern const wchar_t kMetroChromeUserDataSubDir[];
 // Used by Metro Chrome to initiate navigation and search requests.
 extern const wchar_t kMetroNavigationAndSearchMessage[];
 // Used by Metro Chrome to get information about the current tab.
 extern const wchar_t kMetroGetCurrentTabInfoMessage[];
 #endif
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_CONSTANTS_H_