BUILD.gn: Disable pool alloc on all translator dependents when fuzzing

It contains defines that need to be consistent between the header and
the implementation.

BUG=angleproject:1522
BUG=chromium:647807

Change-Id: Ica144c455b7366bd9939a07b171edffe5af8bf35
Reviewed-on: https://chromium-review.googlesource.com/386945
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

BUILD.gn

@@ -115,9 +115,10 @@ static_library("preprocessor") {
 
 config("translator_static_config") {
   defines = [ "ANGLE_TRANSLATOR_STATIC" ]
-  if (use_libfuzzer) {
-    defines += [ "ANGLE_TRANSLATOR_DISABLE_POOL_ALLOC" ]
-  }
+}
+
+config("translator_disable_pool_alloc") {
+  defines = [ "ANGLE_TRANSLATOR_DISABLE_POOL_ALLOC" ]
 }
 
 config("debug_annotations_config") {
@@ -203,6 +204,9 @@ static_library("translator_lib") {
     ":translator_static_config",
   ]
   public_configs = [ ":external_config" ]
+  if (use_libfuzzer) {
+    all_dependent_configs = [ ":translator_disable_pool_alloc" ]
+  }
 
   deps = [
     ":includes",