Move GetVersionStringModifier() and GetChannel() from platform_util_* to chrome_version_info_*

chrome/common/chrome_version_info_linux.cc

+// Copyright (c) 2011 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/common/chrome_version_info.h"
+
+namespace chrome {
+
+// static. Warning: this may be either Linux or ChromeOS.
+std::string VersionInfo::GetVersionStringModifier() {
+  char* env = getenv("CHROME_VERSION_EXTRA");
+  if (!env)
+    return std::string();
+  std::string modifier(env);
+
+#if defined(GOOGLE_CHROME_BUILD)
+  // Only ever return "", "unknown", "dev" or "beta" in a branded build.
+  if (modifier == "unstable")  // linux version of "dev"
+    modifier = "dev";
+  if (modifier == "stable") {
+    modifier = "";
+  } else if ((modifier == "dev") || (modifier == "beta")) {
+    // do nothing.
+  } else {
+    modifier = "unknown";
+  }
+#endif
+
+  return modifier;
+}
+
+// static. Warning: this may be either Linux or ChromeOS.
+VersionInfo::Channel VersionInfo::GetChannel() {
+#if defined(GOOGLE_CHROME_BUILD)
+  std::string channel = GetVersionStringModifier();
+  if (channel.empty()) {
+    return CHANNEL_STABLE;
+  } else if (channel == "beta") {
+    return CHANNEL_BETA;
+  } else if (channel == "dev") {
+    return CHANNEL_DEV;
+  } else if (channel == "canary") {
+    return CHANNEL_CANARY;
+  }
+#endif
+
+  return CHANNEL_UNKNOWN;
+}
+
+}  // namespace chrome