Update all users of base::Version to explicitly specify the namespace, and clean up the header.

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 d6d06abc5b1f8ce1bd32bb166f368aab96685626..c67a036c3cb6bdc09bbce73be088de067d405fba 100644
--- a/chrome/installer/util/installation_state.cc
+++ b/chrome/installer/util/installation_state.cc
@@ -60,7 +60,7 @@ bool ProductState::Initialize(bool system_install,
     std::wstring version_str;
     if (key.ReadValue(google_update::kRegVersionField,
                       &version_str) == ERROR_SUCCESS) {
-      version_.reset(new Version(WideToASCII(version_str)));
+      version_.reset(new base::Version(WideToASCII(version_str)));
       if (!version_->IsValid())
         version_.reset();
     }
@@ -70,7 +70,7 @@ bool ProductState::Initialize(bool system_install,
     // only be accessible via InstallationState::GetNonVersionedProductState.
     if (key.ReadValue(google_update::kRegOldVersionField,
                       &version_str) == ERROR_SUCCESS) {
-      old_version_.reset(new Version(WideToASCII(version_str)));
+      old_version_.reset(new base::Version(WideToASCII(version_str)));
       if (!old_version_->IsValid())
         old_version_.reset();
     }
@@ -147,16 +147,17 @@ base::FilePath ProductState::GetSetupPath() const {
   return uninstall_command_.GetProgram();
 }
 
-const Version& ProductState::version() const {
+const base::Version& ProductState::version() const {
   DCHECK(version_.get() != NULL);
   return *version_;
 }
 
 ProductState& ProductState::CopyFrom(const ProductState& other) {
   channel_.set_value(other.channel_.value());
-  version_.reset(other.version_.get() ? new Version(*other.version_) : NULL);
+  version_.reset(
+      other.version_.get() ? new base::Version(*other.version_) : NULL);
   old_version_.reset(
-      other.old_version_.get() ? new Version(*other.old_version_) : NULL);
+      other.old_version_.get() ? new base::Version(*other.old_version_) : NULL);
   brand_ = other.brand_;
   rename_cmd_ = other.rename_cmd_;
   uninstall_command_ = other.uninstall_command_;