Use C++11 features in core/html

Source/core/html/parser/HTMLSrcsetParser.cpp

Index: Source/core/html/parser/HTMLSrcsetParser.cpp
diff --git a/Source/core/html/parser/HTMLSrcsetParser.cpp b/Source/core/html/parser/HTMLSrcsetParser.cpp
index b2b02ccd510c245618fd46348990af33359a878a..72b50045357a4248f46a31d22f2c78b3eb1a5e09 100644
--- a/Source/core/html/parser/HTMLSrcsetParser.cpp
+++ b/Source/core/html/parser/HTMLSrcsetParser.cpp
@@ -179,15 +179,15 @@ static void tokenizeDescriptors(const CharType* attributeStart,
 template<typename CharType>
 static bool parseDescriptors(const CharType* attribute, Vector<DescriptorToken>& descriptors, DescriptorParsingResult& result)
 {
-    for (Vector<DescriptorToken>::iterator it = descriptors.begin(); it != descriptors.end(); ++it) {
-        if (it->length == 0)
+    for (auto& descriptor : descriptors) {
+        if (descriptor.length == 0)
             continue;
-        CharType c = attribute[it->lastIndex()];
+        CharType c = attribute[descriptor.lastIndex()];
         bool isValid = false;
         if (RuntimeEnabledFeatures::pictureSizesEnabled() && c == 'w') {
             if (result.hasDensity() || result.hasWidth())
                 return false;
-            int resourceWidth = it->toInt(attribute, isValid);
+            int resourceWidth = descriptor.toInt(attribute, isValid);
             if (!isValid || resourceWidth <= 0)
                 return false;
             result.setResourceWidth(resourceWidth);
@@ -196,14 +196,14 @@ static bool parseDescriptors(const CharType* attribute, Vector<DescriptorToken>&
             // The value of the 'h' descriptor is not used.
             if (result.hasDensity() || result.hasHeight())
                 return false;
-            int resourceHeight = it->toInt(attribute, isValid);
+            int resourceHeight = descriptor.toInt(attribute, isValid);
             if (!isValid || resourceHeight <= 0)
                 return false;
             result.setResourceHeight(resourceHeight);
         } else if (c == 'x') {
             if (result.hasDensity() || result.hasHeight() || result.hasWidth())
                 return false;
-            float density = it->toFloat(attribute, isValid);
+            float density = descriptor.toFloat(attribute, isValid);
             if (!isValid || density < 0)
                 return false;
             result.setDensity(density);
@@ -294,12 +294,12 @@ static ImageCandidate pickBestImageCandidate(float deviceScaleFactor, float sour
         return ImageCandidate();
 
     // http://picture.responsiveimages.org/#normalize-source-densities
-    for (Vector<ImageCandidate>::iterator it = imageCandidates.begin(); it != imageCandidates.end(); ++it) {
-        if (it->resourceWidth() > 0) {
-            it->setDensity((float)it->resourceWidth() / sourceSize);
+    for (auto& image : imageCandidates) {
+        if (image.resourceWidth() > 0) {
+            image.setDensity((float)image.resourceWidth() / sourceSize);
             ignoreSrc = true;
-        } else if (it->density() < 0) {
-            it->setDensity(defaultDensityValue);
+        } else if (image.density() < 0) {
+            image.setDensity(defaultDensityValue);
         }
     }