[clang-tidy] Readability fixes for src/components/[d-l].*

- Get rid of redundant .c_str() for std::string,
- Get rid of redundant .get() for std::unique_ptr,
- Get rid of redundant member initializations
- Replace NULL -> nullptr.

R=blundell@chromium.org, caitkp@chromium.org, jochen@chromium.org, sdefresne@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ic043a0bf296132eadd1b8a6e349d3a5f903fbaec
Reviewed-on: https://chromium-review.googlesource.com/1045965
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Alexander Yashkin <a-v-y@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#559197}

CrOS-Libchrome-Original-Commit: ead3f745666b12ade97a50b8ad48cab0d24e5afb

2 files changed, 2 insertions, 2 deletions

diff --git a/components/json_schema/json_schema_validator_unittest.cc b/components/json_schema/json_schema_validator_unittest.cc
index b37009238f..19fc6f9b20 100644
--- a/components/json_schema/json_schema_validator_unittest.cc
+++ b/components/json_schema/json_schema_validator_unittest.cc
@@ -11,7 +11,7 @@
 
 class JSONSchemaValidatorCPPTest : public JSONSchemaValidatorTestBase {
  public:
-  JSONSchemaValidatorCPPTest() : JSONSchemaValidatorTestBase() {}
+  JSONSchemaValidatorCPPTest() {}
 
  protected:
   void ExpectValid(const std::string& test_source,
diff --git a/components/json_schema/json_schema_validator_unittest_base.cc b/components/json_schema/json_schema_validator_unittest_base.cc
index 6f8e079bbe..ce220dc479 100644
--- a/components/json_schema/json_schema_validator_unittest_base.cc
+++ b/components/json_schema/json_schema_validator_unittest_base.cc
@@ -46,7 +46,7 @@ base::Value* LoadValue(const std::string& filename) {
 
 base::Value* LoadValue(const std::string& filename, base::Value::Type type) {
   std::unique_ptr<base::Value> result(LoadValue(filename));
-  if (!result.get())
+  if (!result)
     return nullptr;
   if (result->type() != type) {
     ADD_FAILURE() << "Expected type " << type << ", got: " << result->type();