Disallow PGO optimization for Chromecast

Bug: local 169779668
Test: tryjobs
Change-Id: I7978e19241c1041c9a91533e6098684f7a4c9f99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486075Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: Sandeep Vijayasekar <sandv@google.com>
Cr-Commit-Position: refs/heads/master@{#818696}

build/config/compiler/pgo/pgo.gni

@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/chromecast_build.gni")
 import("//build/config/chromeos/ui_mode.gni")
 
 declare_args() {
@@ -12,7 +13,7 @@ declare_args() {
   #     2 : Used during the PGO (optimization) phase.
   chrome_pgo_phase = 0
   if (is_official_build &&
-      (is_win || is_mac || (is_linux && !chromeos_is_browser_only))) {
+      (is_win || is_mac || (is_linux && !chromeos_is_browser_only && !is_chromecast))) {
     chrome_pgo_phase = 2
   }