Added missing dependency.

chrome/app/BUILD.gn's target generated_resources generates
grit/generated_resources.h which we overwrite via chromium_src
and include brave/grit/brave_generated_resources.h. We need
to make sure that that header exists, so generated_resources
target needs to depend on //brave/app:brave_generated_resources_grit.

patches/chrome-app-BUILD.gn.patch

@@ -1,8 +1,19 @@
 diff --git a/chrome/app/BUILD.gn b/chrome/app/BUILD.gn
-index 8670f53f406ec4fbc41f7e35667fa0f73f6037cb..5547f4533046725932967cba9eb6519cb6d2e7c9 100644
+index 8670f53f406ec4fbc41f7e35667fa0f73f6037cb..8fd6ea8f18195c3730096a493fd01498222500d1 100644
 --- a/chrome/app/BUILD.gn
 +++ b/chrome/app/BUILD.gn
-@@ -259,7 +259,7 @@ grit("google_chrome_strings") {
+@@ -182,6 +182,10 @@ grit("generated_resources") {
+   if (is_android) {
+     outputs += android_generated_java_resources
+   }
++
++  deps = [
++    "//brave/app:brave_generated_resources_grit",
++  ]
+ }
+
+ if (is_android) {
+@@ -259,7 +263,7 @@ grit("google_chrome_strings") {
  }
 
  grit("chromium_strings") {
@@ -11,7 +22,7 @@ index 8670f53f406ec4fbc41f7e35667fa0f73f6037cb..5547f4533046725932967cba9eb6519c
    defines = chrome_grit_defines
    output_dir = "$root_gen_dir/chrome"
    outputs = [
-@@ -344,6 +344,7 @@ static_library("test_support") {
+@@ -344,6 +348,7 @@ static_library("test_support") {
      "//components/nacl/common:buildflags",
      "//components/startup_metric_utils/browser:lib",
      "//components/tracing",