Remove using directives ("using namespace x") from blink/renderer/core/loader/.

Bug: 82078
Change-Id: I5883996d3474f10898689defc6bdfd0932b332f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866263
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707266}

third_party/blink/renderer/core/loader/form_submission.cc

@@ -52,8 +52,6 @@
 
 namespace blink {
 
-using namespace html_names;
-
 static int64_t GenerateFormDataIdentifier() {
   // Initialize to the current time to reduce the likelihood of generating
   // identifiers that overlap with those from past/future browser sessions.
@@ -183,16 +181,20 @@ FormSubmission* FormSubmission::Create(HTMLFormElement* form,
   copied_attributes.CopyFrom(attributes);
   if (submit_button) {
     AtomicString attribute_value;
-    if (!(attribute_value = submit_button->FastGetAttribute(kFormactionAttr))
+    if (!(attribute_value =
+              submit_button->FastGetAttribute(html_names::kFormactionAttr))
              .IsNull())
       copied_attributes.ParseAction(attribute_value);
-    if (!(attribute_value = submit_button->FastGetAttribute(kFormenctypeAttr))
+    if (!(attribute_value =
+              submit_button->FastGetAttribute(html_names::kFormenctypeAttr))
              .IsNull())
       copied_attributes.UpdateEncodingType(attribute_value);
-    if (!(attribute_value = submit_button->FastGetAttribute(kFormmethodAttr))
+    if (!(attribute_value =
+              submit_button->FastGetAttribute(html_names::kFormmethodAttr))
              .IsNull())
       copied_attributes.UpdateMethodType(attribute_value);
-    if (!(attribute_value = submit_button->FastGetAttribute(kFormtargetAttr))
+    if (!(attribute_value =
+              submit_button->FastGetAttribute(html_names::kFormtargetAttr))
              .IsNull())
       copied_attributes.SetTarget(attribute_value);
   }

third_party/blink/renderer/core/loader/frame_loader.cc

@@ -123,8 +123,6 @@
 
 namespace blink {
 
-using namespace html_names;
-
 bool IsBackForwardLoadType(WebFrameLoadType type) {
   return type == WebFrameLoadType::kBackForward;
 }