Removing "using" declarations that import names in the C++ Standard library.

Source/core/page/ScopedPageLoadDeferrer.cpp

Index: Source/core/page/ScopedPageLoadDeferrer.cpp
diff --git a/Source/core/page/ScopedPageLoadDeferrer.cpp b/Source/core/page/ScopedPageLoadDeferrer.cpp
index 1387aef793672fcdcf376fd39504212cb4b80322..9dbad8c362157297edf277f97426893b9905ed90 100644
--- a/Source/core/page/ScopedPageLoadDeferrer.cpp
+++ b/Source/core/page/ScopedPageLoadDeferrer.cpp
@@ -29,8 +29,6 @@
 
 namespace WebCore {
 
-using namespace std;
-
 ScopedPageLoadDeferrer::ScopedPageLoadDeferrer(Page* exclusion)
 {
     const HashSet<Page*>& pages = Page::ordinaryPages();
@@ -55,8 +53,8 @@ ScopedPageLoadDeferrer::ScopedPageLoadDeferrer(Page* exclusion)
         }
     }
 
-    size_t count = m_deferredFrames.size();
-    for (size_t i = 0; i < count; ++i) {
+    std::size_t count = m_deferredFrames.size();
+    for (std::size_t i = 0; i < count; ++i) {
         if (Page* page = m_deferredFrames[i]->page())
             page->setDefersLoading(true);
     }
@@ -64,7 +62,7 @@ ScopedPageLoadDeferrer::ScopedPageLoadDeferrer(Page* exclusion)
 
 ScopedPageLoadDeferrer::~ScopedPageLoadDeferrer()
 {
-    for (size_t i = 0; i < m_deferredFrames.size(); ++i) {
+    for (std::size_t i = 0; i < m_deferredFrames.size(); ++i) {
         if (Page* page = m_deferredFrames[i]->page()) {
             page->setDefersLoading(false);