Remove multi-install from install_static.

chrome/install_static/product_install_details.h

Index: chrome/install_static/product_install_details.h
diff --git a/chrome/install_static/product_install_details.h b/chrome/install_static/product_install_details.h
index 54843b6c7c051de4870f41c4897404724c8e3952..99e2784d0c84a8b6049e7bb557fcb6ff1dff7331 100644
--- a/chrome/install_static/product_install_details.h
+++ b/chrome/install_static/product_install_details.h
@@ -12,7 +12,6 @@
 
 namespace install_static {
 
-struct InstallConstants;
 class PrimaryInstallDetails;
 
 // Creates product details for the current process and sets them as the global
@@ -36,10 +35,6 @@ bool PathIsInProgramFiles(const std::wstring& path);
 // "...\[kProductName][suffix]\Application".
 std::wstring GetInstallSuffix(const std::wstring& exe_path);
 
-// Returns true if the browser of |mode| at |system_level| is registered as
-// being multi-install.
-bool IsMultiInstall(const InstallConstants& mode, bool system_level);
-
 // Creates product details for the process at |exe_path|.
 std::unique_ptr<PrimaryInstallDetails> MakeProductDetails(
     const std::wstring& exe_path);