Remove multi-install from chrome/installer/setup.

chrome/installer/setup/setup_util.cc

Index: chrome/installer/setup/setup_util.cc
diff --git a/chrome/installer/setup/setup_util.cc b/chrome/installer/setup/setup_util.cc
index 2d03e8c119e4a7f420b7b1ea09f8f8d9e019393d..f4b88069a76c3d6a92c02ea3bc7b49d37689613a 100644
--- a/chrome/installer/setup/setup_util.cc
+++ b/chrome/installer/setup/setup_util.cc
@@ -42,6 +42,8 @@
 #include "chrome/installer/util/installation_state.h"
 #include "chrome/installer/util/master_preferences.h"
 #include "chrome/installer/util/master_preferences_constants.h"
+#include "chrome/installer/util/non_updating_app_registration_data.h"
+#include "chrome/installer/util/updating_app_registration_data.h"
 #include "chrome/installer/util/util_constants.h"
 #include "courgette/courgette.h"
 #include "courgette/third_party/bsdiff/bsdiff.h"
@@ -67,13 +69,6 @@ base::string16 InstallFullName() {
 #endif
 }
 
-// Returns true if product |type| cam be meaningfully installed without the
-// --multi-install flag.
-bool SupportsSingleInstall(BrowserDistribution::Type type) {
-  return (type == BrowserDistribution::CHROME_BROWSER ||
-          type == BrowserDistribution::CHROME_FRAME);
-}
-
 // Returns true if the "lastrun" value in |root|\|key_path| (a path to Chrome's
 // ClientState key for a user) indicates that Chrome has been used within the
 // last 28 days.
@@ -132,6 +127,160 @@ bool OnUserHive(const base::string16& client_state_path,
   return false;
 }
 
+// "The binaries" once referred to the on-disk footprint of Chrome and/or Chrome
+// Frame when the products were configured to share such on-disk bits. Support
+// for this mode of install was dropped from ToT in December 2016. Remove any
+// stray bits in the registry leftover from such installs.
+void RemoveBinariesVersionKey(const InstallerState& installer_state) {
+#if defined(GOOGLE_CHROME_BUILD)
+  UpdatingAppRegistrationData reg_data(
+      L"{4DC8B4CA-1BDA-483e-B5FA-D3C12E15B62D}");
+#else
+  NonUpdatingAppRegistrationData reg_data(L"Software\\Chromium Binaries");
+#endif
+
+  base::string16 path(reg_data.GetVersionKey());
+  if (base::win::RegKey(installer_state.root_key(), path.c_str(),
+                        KEY_QUERY_VALUE | KEY_WOW64_32KEY)
+          .Valid()) {
+    const bool success = InstallUtil::DeleteRegistryKey(
+        installer_state.root_key(), path, KEY_WOW64_32KEY);
+    UMA_HISTOGRAM_BOOLEAN("Setup.Install.DeleteBinariesClientsKey", success);
+  }
+}
+
+// Remove leftover traces of multi-install Chrome Frame, if present. Once upon a
+// time, Google Chrome Frame could be co-installed with Chrome such that they
+// shared the same binaries on disk. Support for new installs of GCF was dropped
+// from ToT in December 2013. Remove any stray bits in the registry leftover
+// from an old multi-install GCF.
+void RemoveMultiChromeFrame(const InstallerState& installer_state) {
+// There never was a "Chromium Frame".
+#if defined(GOOGLE_CHROME_BUILD)
+  // To maximize cleanup, unconditionally delete GCF's Clients and ClientState
+  // keys unless single-install GCF is present. This condition is satisfied if
+  // both keys exist, Clients\pv contains a value, and
+  // ClientState\UninstallString contains a path including "\Chrome Frame\".
+  // Multi-install GCF would have had "\Chrome\", and anything else is garbage.
+
+  UpdatingAppRegistrationData gcf_data(
+      L"{8BA986DA-5100-405E-AA35-86F34A02ACBF}");
+  base::win::RegKey clients_key;
+  base::win::RegKey client_state_key;
+
+  const bool has_clients_key =
+      clients_key.Open(installer_state.root_key(),
+                       gcf_data.GetVersionKey().c_str(),
+                       KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS;
+  const bool has_client_state_key =
+      client_state_key.Open(installer_state.root_key(),
+                            gcf_data.GetStateKey().c_str(),
+                            KEY_QUERY_VALUE | KEY_WOW64_32KEY) == ERROR_SUCCESS;
+  if (!has_clients_key && !has_client_state_key)
+    return;  // Nothing to check or to clean.
+
+  base::string16 value;
+  if (has_clients_key && has_client_state_key &&
+      clients_key.ReadValue(google_update::kRegVersionField, &value) ==
+          ERROR_SUCCESS &&
+      !value.empty() &&
+      client_state_key.ReadValue(kUninstallStringField, &value) ==
+          ERROR_SUCCESS &&
+      value.find(L"\\Chrome Frame\\") != base::string16::npos) {
+    return;  // Single-install Chrome Frame found.
+  }
+  client_state_key.Close();
+  clients_key.Close();
+
+  // Remnants of multi-install GCF or of a malformed GCF are present. Remove the
+  // Clients and ClientState keys so that Google Update ceases to check for
+  // updates, and the Programs and Features control panel entry to reduce user
+  // confusion.
+  constexpr int kOperations = 3;
+  int success_count = 0;
+
+  if (InstallUtil::DeleteRegistryKey(installer_state.root_key(),
+                                     gcf_data.GetVersionKey(),
+                                     KEY_WOW64_32KEY)) {
+    ++success_count;
+  }
+  if (InstallUtil::DeleteRegistryKey(installer_state.root_key(),
+                                     gcf_data.GetStateKey(), KEY_WOW64_32KEY)) {
+    ++success_count;
+  }
+  if (InstallUtil::DeleteRegistryKey(
+          installer_state.root_key(),
+          L"Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\"
+          L"Google Chrome Frame",
+          KEY_WOW64_32KEY)) {
+    ++success_count;
+  }
+  DCHECK_LE(success_count, kOperations);
+
+  // Used for a histogram; do not reorder.
+  enum MultiChromeFrameRemovalResult {
+    ALL_FAILED = 0,
+    PARTIAL_SUCCESS = 1,
+    SUCCESS = 2,
+    NUM_RESULTS
+  };
+  MultiChromeFrameRemovalResult result =
+      (success_count == kOperations ? SUCCESS : (success_count ? PARTIAL_SUCCESS
+                                                               : ALL_FAILED));
+  UMA_HISTOGRAM_ENUMERATION("Setup.Install.MultiChromeFrameRemoved", result,
+                            NUM_RESULTS);
+#endif  // GOOGLE_CHROME_BUILD
+}
+
+void RemoveAppLauncherVersionKey(const InstallerState& installer_state) {
+// The app launcher was only registered for Google Chrome.
+#if defined(GOOGLE_CHROME_BUILD)
+  UpdatingAppRegistrationData reg_data(
+      L"{FDA71E6F-AC4C-4a00-8B70-9958A68906BF}");
+
+  base::string16 path(reg_data.GetVersionKey());
+  if (base::win::RegKey(installer_state.root_key(), path.c_str(),
+                        KEY_QUERY_VALUE | KEY_WOW64_32KEY)
+          .Valid()) {
+    const bool succeeded = InstallUtil::DeleteRegistryKey(
+        installer_state.root_key(), path, KEY_WOW64_32KEY);
+    UMA_HISTOGRAM_BOOLEAN("Setup.Install.DeleteAppLauncherClientsKey",
+                          succeeded);
+  }
+#endif  // GOOGLE_CHROME_BUILD
+}
+
+void RemoveAppHostExe(const InstallerState& installer_state) {
+// The app host was only installed for Google Chrome.
+#if defined(GOOGLE_CHROME_BUILD)
+  base::FilePath app_host(
+      installer_state.target_path().Append(FILE_PATH_LITERAL("app_host.exe")));
+
+  if (base::PathExists(app_host)) {
+    const bool succeeded = base::DeleteFile(app_host, false);
+    UMA_HISTOGRAM_BOOLEAN("Setup.Install.DeleteAppHost", succeeded);
+  }
+#endif  // GOOGLE_CHROME_BUILD
+}
+
+void RemoveLegacyChromeAppCommands(const InstallerState& installer_state) {
+// These app commands were only registered for Google Chrome.
+#if defined(GOOGLE_CHROME_BUILD)
+  base::string16 path(GetRegistrationDataCommandKey(
+      installer_state.product().distribution()->GetAppRegistrationData(),
+      L"install-extension"));
+
+  if (base::win::RegKey(installer_state.root_key(), path.c_str(),
+                        KEY_QUERY_VALUE | KEY_WOW64_32KEY)
+          .Valid()) {
+    const bool succeeded = InstallUtil::DeleteRegistryKey(
+        installer_state.root_key(), path, KEY_WOW64_32KEY);
+    UMA_HISTOGRAM_BOOLEAN("Setup.Install.DeleteInstallExtensionCommand",
+                          succeeded);
+  }
+#endif  // GOOGLE_CHROME_BUILD
+}
+
 }  // namespace
 
 const char kUnPackStatusMetricsName[] = "Setup.Install.LzmaUnPackStatus";
@@ -302,32 +451,6 @@ bool DeleteFileFromTempProcess(const base::FilePath& path,
   return ok != FALSE;
 }
 
-// There are 4 disjoint cases => return values {false,true}:
-// (1) Product is being uninstalled => false.
-// (2) Product is being installed => true.
-// (3) Current operation ignores product, product is absent => false.
-// (4) Current operation ignores product, product is present => true.
-bool WillProductBePresentAfterSetup(
-    const installer::InstallerState& installer_state,
-    const installer::InstallationState& machine_state,
-    BrowserDistribution::Type type) {
-  DCHECK(SupportsSingleInstall(type) || installer_state.is_multi_install());
-
-  const ProductState* product_state =
-      machine_state.GetProductState(installer_state.system_install(), type);
-
-  // Determine if the product is present prior to the current operation.
-  bool is_present = (product_state != NULL);
-  bool is_uninstall = installer_state.operation() == InstallerState::UNINSTALL;
-
-  // Determine if current operation affects the product.
-  const Product* product = installer_state.FindProduct(type);
-  bool is_affected = (product != NULL);
-
-  // Decide among {(1),(2),(3),(4)}.
-  return is_affected ? !is_uninstall : is_present;
-}
-
 bool AdjustProcessPriority() {
   if (base::win::GetVersion() >= base::win::VERSION_VISTA) {
     DWORD priority_class = ::GetPriorityClass(::GetCurrentProcess());
@@ -732,6 +855,23 @@ void DeRegisterEventLogProvider() {
                                  WorkItem::kWow64Default);
 }
 
+void DoLegacyCleanups(const InstallerState& installer_state,
+                      InstallStatus install_status) {
+  // Do no harm if the install didn't succeed.
+  if (InstallUtil::GetInstallReturnCode(install_status))
+    return;
+
+  // The cleanups below only apply to normal Chrome, not side-by-side (canary).
+  if (InstallUtil::IsChromeSxSProcess())
+    return;
+
+  RemoveBinariesVersionKey(installer_state);
+  RemoveMultiChromeFrame(installer_state);
+  RemoveAppLauncherVersionKey(installer_state);
+  RemoveAppHostExe(installer_state);
+  RemoveLegacyChromeAppCommands(installer_state);
+}
+
 ScopedTokenPrivilege::ScopedTokenPrivilege(const wchar_t* privilege_name)
     : is_enabled_(false) {
   HANDLE temp_handle;