Ensure Mojo is initialized in template_url_parser_fuzzer.

Bug: 1021948
Change-Id: I74e0975de611056948613411217b6d6b75a0e6d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912885Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714721}

testing/libfuzzer/fuzzers/BUILD.gn

@@ -66,7 +66,8 @@ fuzzer_test("template_url_parser_fuzzer") {
   deps = [
     "//base",
     "//base:i18n",
-    "//components/search_engines:search_engines",
+    "//components/search_engines",
+    "//mojo/core/embedder",
     "//services/data_decoder/public/cpp",
     "//services/data_decoder/public/cpp:test_support",
     "//third_party/libxml:libxml",

testing/libfuzzer/fuzzers/template_url_parser_fuzzer.cc

@@ -19,6 +19,7 @@
 #include "components/search_engines/search_terms_data.h"
 #include "components/search_engines/template_url.h"
 #include "components/search_engines/template_url_parser.h"
+#include "mojo/core/embedder/embedder.h"
 #include "services/data_decoder/public/cpp/test_support/in_process_data_decoder.h"
 #include "testing/libfuzzer/libfuzzer_exports.h"
 
@@ -48,7 +49,10 @@ void ignore(void* ctx, const char* msg, ...) {
 
 class Env {
  public:
-  Env() { xmlSetGenericErrorFunc(nullptr, &ignore); }
+  Env() : executor_(base::MessagePumpType::IO) {
+    mojo::core::Init();
+    xmlSetGenericErrorFunc(nullptr, &ignore);
+  }
 
  private:
   base::SingleThreadTaskExecutor executor_;