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

Source/core/frame/LocalFrame.cpp

Index: Source/core/frame/LocalFrame.cpp
diff --git a/Source/core/frame/LocalFrame.cpp b/Source/core/frame/LocalFrame.cpp
index a78ad7a30f2e82044f157a6f61568411b7a40c45..93cbd21748652acd0f570ff6c3d29431a2fcefaa 100644
--- a/Source/core/frame/LocalFrame.cpp
+++ b/Source/core/frame/LocalFrame.cpp
@@ -66,6 +66,8 @@
 #include "wtf/PassOwnPtr.h"
 #include "wtf/StdLibExtras.h"
 
+using namespace std;
+
 namespace WebCore {
 
 using namespace HTMLNames;
@@ -223,12 +225,12 @@
         return FloatSize();
 
     if (contentRenderer()->style()->isHorizontalWritingMode()) {
-        ASSERT(fabs(originalSize.width()) > std::numeric_limits<float>::epsilon());
+        ASSERT(fabs(originalSize.width()) > numeric_limits<float>::epsilon());
         float ratio = originalSize.height() / originalSize.width();
         resultSize.setWidth(floorf(expectedSize.width()));
         resultSize.setHeight(floorf(resultSize.width() * ratio));
     } else {
-        ASSERT(fabs(originalSize.height()) > std::numeric_limits<float>::epsilon());
+        ASSERT(fabs(originalSize.height()) > numeric_limits<float>::epsilon());
         float ratio = originalSize.width() / originalSize.height();
         resultSize.setHeight(floorf(expectedSize.height()));
         resultSize.setWidth(floorf(resultSize.height() * ratio));