Rename blink::AtomicString::Lower() to DeprecatedLower().

third_party/WebKit/Source/platform/wtf/text/AtomicString.h

Index: third_party/WebKit/Source/platform/wtf/text/AtomicString.h
diff --git a/third_party/WebKit/Source/platform/wtf/text/AtomicString.h b/third_party/WebKit/Source/platform/wtf/text/AtomicString.h
index be86d59499fc6bd7e118141dfa674561bb7715a1..4361d1f9ccf664d214eb1ba441ec761b6265b522 100644
--- a/third_party/WebKit/Source/platform/wtf/text/AtomicString.h
+++ b/third_party/WebKit/Source/platform/wtf/text/AtomicString.h
@@ -165,9 +165,12 @@ class WTF_EXPORT AtomicString {
 
   // Returns a lowercase version of the string. This function might
   // convert non-ASCII characters to ASCII characters. For example,
-  // lower() for U+212A is 'k'.
+  // DeprecatedLower() for U+212A is 'k'.
   // This function is rarely used to implement web platform features.
-  AtomicString Lower() const;
+  // See crbug.com/627682.
+  // This function is deprecated. We should use LowerASCII(), or introduce
+  // LowerUnicode().
+  AtomicString DeprecatedLower() const;
 
   // Returns a lowercase/uppercase version of the string.
   // These functions convert ASCII characters only.