Use StringView for equalIgnoringCase.

third_party/WebKit/Source/wtf/text/StringView.h

Index: third_party/WebKit/Source/wtf/text/StringView.h
diff --git a/third_party/WebKit/Source/wtf/text/StringView.h b/third_party/WebKit/Source/wtf/text/StringView.h
index a4ea6692240fd2a68a4f1b9e1034bff9ec30844a..f6e7576a8a7e9191206c81483223d19a0fd8ed9a 100644
--- a/third_party/WebKit/Source/wtf/text/StringView.h
+++ b/third_party/WebKit/Source/wtf/text/StringView.h
@@ -39,9 +39,15 @@ public:
         : StringView(view, offset, view.m_length - offset) {}
 
     // From a StringImpl:
-    StringView(StringImpl*);
-    StringView(StringImpl*, unsigned offset);
-    StringView(StringImpl*, unsigned offset, unsigned length);
+    StringView(const StringImpl*);
+    StringView(const StringImpl*, unsigned offset);
+    StringView(const StringImpl*, unsigned offset, unsigned length);
+
+    // From a non-null StringImpl.
+    StringView(const StringImpl& impl)
+        : m_impl(const_cast<StringImpl*>(&impl))
+        , m_bytes(impl.bytes())
+        , m_length(impl.length()) {}
 
     // From a non-null StringImpl, avoids the null check.
     StringView(StringImpl& impl)
@@ -133,7 +139,7 @@ public:
     AtomicString toAtomicString() const;
 
 private:
-    void set(StringImpl&, unsigned offset, unsigned length);
+    void set(const StringImpl&, unsigned offset, unsigned length);
 
     // We use the StringImpl to mark for 8bit or 16bit, even for strings where
     // we were constructed from a char pointer. So m_impl->bytes() might have
@@ -162,23 +168,23 @@ inline StringView::StringView(const StringView& view, unsigned offset, unsigned
         m_characters16 = view.characters16() + offset;
 }
 
-inline StringView::StringView(StringImpl* impl)
+inline StringView::StringView(const StringImpl* impl)
 {
     if (!impl) {
         clear();
         return;
     }
-    m_impl = impl;
+    m_impl = const_cast<StringImpl*>(impl);
     m_length = impl->length();
     m_bytes = impl->bytes();
 }
 
-inline StringView::StringView(StringImpl* impl, unsigned offset)
+inline StringView::StringView(const StringImpl* impl, unsigned offset)
 {
     impl ? set(*impl, offset, impl->length() - offset) : clear();
 }
 
-inline StringView::StringView(StringImpl* impl, unsigned offset, unsigned length)
+inline StringView::StringView(const StringImpl* impl, unsigned offset, unsigned length)
 {
     impl ? set(*impl, offset, length) : clear();
 }
@@ -200,18 +206,21 @@ inline void StringView::clear()
     m_impl = StringImpl::empty(); // mark as 8 bit.
 }
 
-inline void StringView::set(StringImpl& impl, unsigned offset, unsigned length)
+inline void StringView::set(const StringImpl& impl, unsigned offset, unsigned length)
 {
     SECURITY_DCHECK(offset + length <= impl.length());
     m_length = length;
-    m_impl = &impl;
+    m_impl = const_cast<StringImpl*>(&impl);
     if (impl.is8Bit())
         m_characters8 = impl.characters8() + offset;
     else
         m_characters16 = impl.characters16() + offset;
 }
 
-WTF_EXPORT bool equalIgnoringASCIICase(const StringView& a, const StringView& b);
+WTF_EXPORT bool equalIgnoringCase(const StringView&, const StringView&);
+WTF_EXPORT bool equalIgnoringASCIICase(const StringView&, const StringView&);
+
+WTF_EXPORT bool equalIgnoringCaseAndNullity(const StringView&, const StringView&);
 
 // TODO(esprehn): Can't make this an overload of WTF::equal since that makes
 // calls to equal() that pass literal strings ambiguous. Figure out if we can
@@ -231,5 +240,8 @@ inline bool operator!=(const StringView& a, const StringView& b)
 } // namespace WTF
 
 using WTF::StringView;
+using WTF::equalIgnoringASCIICase;
+using WTF::equalIgnoringCase;
+
 
 #endif