[Fetch] Request with GET/HEAD method cannot have body

LayoutTests/http/tests/serviceworker/resources/cache-delete-worker.js

 importScripts('worker-testharness.js');
 importScripts('/resources/testharness-helpers.js');
 
 var test_url = 'https://example.com/foo';
 
 // Construct a generic Request object. The URL is |test_url|. All other fields
 // are defaults.
 function new_test_request() {
   return new Request(test_url);
 }
@@ skipping 23 matching lines @@
         })
       .then(function() {
           assert_promise_rejects(
             cache.match(test_url),
             'NotFoundError',
             'Cache.delete should remove matching entries from cache.');
         });
   }, 'Cache.delete called with a string URL');
 
 cache_test(function(cache) {
-    var request = new Request(test_url, { body: 'Abc' });
+    var request = new Request(test_url, { method: 'POST', body: 'Abc' });
     return cache.put(request.clone(), new_test_response())
       .then(function() {
           return cache.delete(request);
         })
       .then(function(result) {
           assert_true(result,
                       'Cache.delete should resolve with "true" if an entry ' +
                       'was successfully deleted.');
           assert_false(request.bodyUsed,
                        'Cache.delete should not consume request body.');
         });
   }, 'Cache.delete called with a Request object');
 
 cache_test(function(cache) {
-    var request = new Request(test_url, { body: 'Abc' });
+    var request = new Request(test_url, { method: 'POST', body: 'Abc' });
     return cache.put(request.clone(), new_test_response())
       .then(function() {
           return request.text();
         })
       .then(function() {
           assert_true(request.bodyUsed,
                       '[https://fetch.spec.whatwg.org/#body-mixin] ' +
                       'Request.bodyUsed should be true after text() method ' +
                       'resolves.');
         })
@@ skipping 78 matching lines @@
 
 prepopulated_cache_test(function(cache) {
     return cache.delete('http://example.com/ac', { prefixMatch: true })
       .then(function(result) {
           assert_false(result,
                        'Cache.delete should resolve with "false" if there ' +
                        'are no matching entries.');
         });
   }, 'Cache.delete with CacheQueryOptions.* that don\'t match');