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

Source/core/editing/htmlediting.cpp

Index: Source/core/editing/htmlediting.cpp
diff --git a/Source/core/editing/htmlediting.cpp b/Source/core/editing/htmlediting.cpp
index cde332cc6ccddc1d6808bc4bdfab34fd7240ff19..ed966532a7af5f31d67378631e6c629358545dac 100644
--- a/Source/core/editing/htmlediting.cpp
+++ b/Source/core/editing/htmlediting.cpp
@@ -57,8 +57,6 @@
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 
-using namespace std;
-
 namespace WebCore {
 
 using namespace HTMLNames;
@@ -370,7 +368,7 @@ String stringWithRebalancedWhitespace(const String& string, bool startIsStartOfP
     rebalancedString.reserveCapacity(length);
 
     bool previousCharacterWasSpace = false;
-    for (size_t i = 0; i < length; i++) {
+    for (std::size_t i = 0; i < length; i++) {
         UChar c = string[i];
         if (!isWhitespace(c)) {
             rebalancedString.append(c);