Tidy whitespace, kill useless DCHECK, use auto in one place.

BUG=728223

Change-Id: I4241852401000b5d68b9547dbd23a3d405838020
Reviewed-on: https://chromium-review.googlesource.com/701324
Commit-Queue: Ke He <ke.he@intel.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506936}

device/hid/public/interfaces/hid.mojom

@@ -35,7 +35,7 @@ struct HidDeviceInfo {
   string device_node;
 };
 
-interface HidManagerClient{
+interface HidManagerClient {
   // Notifies the client that a device is added.
   DeviceAdded(HidDeviceInfo device_info);
 

extensions/browser/api/hid/hid_api.cc

@@ -259,8 +259,6 @@ void HidReceiveFunction::OnFinished(
     const base::Optional<std::vector<uint8_t>>& buffer) {
   if (success) {
     DCHECK(buffer);
-    DCHECK_GE(buffer->size(), 0u);
-
     Respond(TwoArguments(
         std::make_unique<base::Value>(report_id),
         base::Value::CreateWithCopiedBuffer(

extensions/browser/api/hid/hid_apitest.cc

@@ -299,7 +299,7 @@ class HidApiTest : public ShellApiTest {
         &collections, &has_report_id, &max_input_report_size,
         &max_output_report_size, &max_feature_report_size);
 
-    device::mojom::HidDeviceInfoPtr device = device::mojom::HidDeviceInfo::New(
+    auto device = device::mojom::HidDeviceInfo::New(
         device_guid, vendor_id, product_id, "Test Device", serial_number,
         device::mojom::HidBusType::kHIDBusTypeUSB, report_descriptor,
         collections, has_report_id, max_input_report_size,