Run clang-tidy modernize-use-equals-{delete,default} on //net/reporting

See the bugs and cxx post for justification and details:
https://groups.google.com/a/chromium.org/forum/#!topic/cxx/RkOHzIK6Tq8

This change was done using clang-tidy as described here:
https://chromium.googlesource.com/chromium/src/+/lkcr/docs/clang_tidy.md

In some cases the the tool leaves behind a string of commas where it
replaced a member initializer list
(https://bugs.llvm.org/show_bug.cgi?id=35051). They were cleaned up with:
  git diff --name-only | \
    xargs sed -E -i 's/(^\s*|\)\s*):[ ,]*= default/\1 = default/'

BUG=778959,778957
This CL was uploaded by git cl split.

[email protected]

Change-Id: Ib3962b07d49ab4e0032abc2fa61fa35faee70971
Reviewed-on: https://chromium-review.googlesource.com/799590
Reviewed-by: Julia Tuttle <[email protected]>
Commit-Queue: Chris Watkins <[email protected]>
Cr-Commit-Position: refs/heads/master@{#520866}
diff --git a/net/reporting/reporting_service.cc b/net/reporting/reporting_service.cc
index e72eb752..935fd6d 100644
--- a/net/reporting/reporting_service.cc
+++ b/net/reporting/reporting_service.cc
@@ -28,7 +28,7 @@
   ReportingServiceImpl(std::unique_ptr<ReportingContext> context)
       : context_(std::move(context)) {}
 
-  ~ReportingServiceImpl() override {}
+  ~ReportingServiceImpl() override = default;
 
   void QueueReport(const GURL& url,
                    const std::string& group,
@@ -61,7 +61,7 @@
 
 }  // namespace
 
-ReportingService::~ReportingService() {}
+ReportingService::~ReportingService() = default;
 
 // static
 std::unique_ptr<ReportingService> ReportingService::Create(