Remove optimize_no_wpo

It existed for Windows, and we currently don't do WPO on Windows.
When we bring it back, it'll likely be different from /GL cl.exe-style
WPO.

Depends on https://chromium-review.googlesource.com/c/chromium/third_party/ffmpeg/+/2065789

Bug: 1053958,598772
Change-Id: Ie2ea04ad54f0d3b6711ffb7682fe1ae15662cb95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066106
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743283}

build/config/compiler/BUILD.gn

@@ -2013,29 +2013,6 @@ config("optimize") {
   ldflags = common_optimize_on_ldflags
 }
 
-# Same config as 'optimize' but without the WPO flag.
-config("optimize_no_wpo") {
-  if (is_win) {
-    # Favor size over speed, /O1 must be before the common flags.
-    # /O1 implies /Os and /GF.
-    cflags = [ "/O1" ] + common_optimize_on_cflags + [ "/Oi" ]
-  } else if (optimize_for_size && !is_nacl) {
-    # Favor size over speed.
-    # TODO(crbug.com/718650): Fix -Os in PNaCl compiler and remove the is_nacl
-    # guard above.
-    if (is_clang) {
-      cflags = [ "-Oz" ] + common_optimize_on_cflags
-    } else {
-      cflags = [ "-Os" ] + common_optimize_on_cflags
-    }
-  } else if (optimize_for_fuzzing) {
-    cflags = [ "-O1" ] + common_optimize_on_cflags
-  } else {
-    cflags = [ "-O2" ] + common_optimize_on_cflags
-  }
-  ldflags = common_optimize_on_ldflags
-}
-
 # Turn off optimizations.
 config("no_optimize") {
   if (is_win) {

chrome/installer/mini_installer/BUILD.gn

@@ -241,18 +241,15 @@ template("generate_mini_installer") {
     ]
 
     # This target is special so we manually override most linker flags and
-    # 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.
+    # specify our own to keep the size down.
     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",
     ]
     configs += [
       ":mini_installer_compiler_flags",
-      "//build/config/compiler:optimize_no_wpo",
       "//build/config/sanitizers:link_executable",
       "//build/config/win:sdk_link",
       "//build/config/win:windowed",