Disable init_stack_vars for mini_installer

mini_installer uses unusual linking configuration to avoid linking CRT.

Bug: 977230
Change-Id: I143a693aebc333c26c56c809038b5de3fab6ef91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946985Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720909}

chrome/installer/mini_installer/BUILD.gn

@@ -55,6 +55,8 @@ source_set("lib") {
     defines = [ "SKIP_ARCHIVE_COMPRESSION" ]
   }
 
+  # Initialization may insert unexpected memset calls.
+  configs -= [ "//build/config/compiler:default_init_stack_vars" ]
   configs += [ ":mini_installer_compiler_flags" ]
 }
 
@@ -248,6 +250,8 @@ template("generate_mini_installer") {
     # specify our own to keep the size down. Also make sure that we don't use
     # WPO as it's not supported by the mini installer.
     configs -= [
+      # Initialization may insert unexpected memset calls.
+      "//build/config/compiler:default_init_stack_vars",
       "//build/config/compiler:default_optimization",
       "//build/config:executable_config",
       "//build/config/win:console",