Revert of Expand WTF::StringView's API to be more like StringPiece.

third_party/WebKit/Source/core/html/parser/HTMLSrcsetParser.h

Index: third_party/WebKit/Source/core/html/parser/HTMLSrcsetParser.h
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLSrcsetParser.h b/third_party/WebKit/Source/core/html/parser/HTMLSrcsetParser.h
index 612b4425d0466e4f72fa20257bbdde108510e4aa..16492ee1c58b5f9af60161b893e3b278a74e4150 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLSrcsetParser.h
+++ b/third_party/WebKit/Source/core/html/parser/HTMLSrcsetParser.h
@@ -34,7 +34,6 @@
 
 #include "core/CoreExport.h"
 #include "wtf/Allocator.h"
-#include "wtf/text/StringView.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
@@ -87,22 +86,21 @@
     }
 
     ImageCandidate(const String& source, unsigned start, unsigned length, const DescriptorParsingResult& result, OriginAttribute originAttribute)
-        : m_source(source)
-        , m_string(source, start, length)
-        , m_density(result.hasDensity() ? result.density() : UninitializedDescriptor)
-        , m_resourceWidth(result.hasWidth() ? result.getResourceWidth() : UninitializedDescriptor)
+        : m_string(source.createView(start, length))
+        , m_density(result.hasDensity()?result.density():UninitializedDescriptor)
+        , m_resourceWidth(result.hasWidth()?result.getResourceWidth():UninitializedDescriptor)
         , m_originAttribute(originAttribute)
     {
     }
 
     String toString() const
     {
-        return m_string.toString();
+        return String(m_string.toString());
     }
 
     AtomicString url() const
     {
-        return AtomicString(toString());
+        return AtomicString(m_string.toString());
     }
 
     void setDensity(float factor)
@@ -131,7 +129,6 @@
     }
 
 private:
-    String m_source; // Keep the StringView buffer alive.
     StringView m_string;
     float m_density;
     int m_resourceWidth;