base/win: Add documentation to RegKey::Read/Write functions.

chrome/installer/util/installation_state.cc

Index: chrome/installer/util/installation_state.cc
diff --git a/chrome/installer/util/installation_state.cc b/chrome/installer/util/installation_state.cc
index ab099246c8276e68a75333c3fca6a3ecb7861a29..c9e246991623f6de48f9c2fdd0c23da3da1c1a17 100644
--- a/chrome/installer/util/installation_state.cc
+++ b/chrome/installer/util/installation_state.cc
@@ -98,18 +98,18 @@ bool ProductState::Initialize(bool system_install,
     // "usagestats" may be absent, 0 (false), or 1 (true).  On the chance that
     // different values are permitted in the future, we'll simply hold whatever
     // we find.
-    has_usagestats_ = (key.ReadValueDW(google_update::kRegUsageStatsField,
-                                       &usagestats_) == ERROR_SUCCESS);
+    has_usagestats_ = (key.ReadValue(google_update::kRegUsageStatsField,
+                                     &usagestats_) == ERROR_SUCCESS);
     // "oeminstall" may be present with any value or absent.
     has_oem_install_ = (key.ReadValue(google_update::kRegOemInstallField,
                                       &oem_install_) == ERROR_SUCCESS);
     // "eulaaccepted" may be absent, 0 or 1.
-    has_eula_accepted_ = (key.ReadValueDW(google_update::kRegEULAAceptedField,
-                                          &eula_accepted_) == ERROR_SUCCESS);
+    has_eula_accepted_ = (key.ReadValue(google_update::kRegEULAAceptedField,
+                                        &eula_accepted_) == ERROR_SUCCESS);
     // "msi" may be absent, 0 or 1
     DWORD dw_value = 0;
-    msi_ = (key.ReadValueDW(google_update::kRegMSIField,
-                            &dw_value) == ERROR_SUCCESS) && (dw_value != 0);
+    msi_ = (key.ReadValue(google_update::kRegMSIField,
+                          &dw_value) == ERROR_SUCCESS) && (dw_value != 0);
     // Multi-install is implied or is derived from the command-line.
     if (distribution->GetType() == BrowserDistribution::CHROME_BINARIES)
       multi_install_ = true;
@@ -124,14 +124,14 @@ bool ProductState::Initialize(bool system_install,
                KEY_QUERY_VALUE) == ERROR_SUCCESS) {
     DWORD dword_value = 0;
 
-    if (key.ReadValueDW(google_update::kRegUsageStatsField,
-                        &dword_value) == ERROR_SUCCESS) {
+    if (key.ReadValue(google_update::kRegUsageStatsField,
+                      &dword_value) == ERROR_SUCCESS) {
       has_usagestats_ = true;
       usagestats_ = dword_value;
     }
 
-    if (key.ReadValueDW(google_update::kRegEULAAceptedField,
-                        &dword_value) == ERROR_SUCCESS) {
+    if (key.ReadValue(google_update::kRegEULAAceptedField,
+                      &dword_value) == ERROR_SUCCESS) {
       has_eula_accepted_ = true;
       eula_accepted_ = dword_value;
     }