Initialize base::CommandLine for template_url_parser_fuzzer.

template_url_parser_fuzzer eventually calls down into code that
interacts with base::CommandLine.

BUG=882155

Change-Id: Id37803e2f3e67a6acc2e5686b136661d3bb0e1ea
Reviewed-on: https://chromium-review.googlesource.com/1218163Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590202}

testing/libfuzzer/fuzzers/template_url_parser_fuzzer.cc

@@ -9,6 +9,7 @@
 #include <string>
 
 #include "base/at_exit.h"
+#include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "components/search_engines/search_terms_data.h"
 #include "components/search_engines/template_url.h"
@@ -16,7 +17,7 @@
 
 class PseudoRandomFilter : public TemplateURLParser::ParameterFilter {
  public:
-  PseudoRandomFilter(uint32_t seed) : generator_(seed), pool_(0, 1) {}
+  explicit PseudoRandomFilter(uint32_t seed) : generator_(seed), pool_(0, 1) {}
   ~PseudoRandomFilter() override = default;
 
   bool KeepParameter(const std::string&, const std::string&) override {
@@ -36,6 +37,7 @@ base::AtExitManager at_exit_manager;  // used by ICU integration
 
 extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {
   CHECK(base::i18n::InitializeICU());
+  CHECK(base::CommandLine::Init(*argc, *argv));
   return 0;
 }