Removes the useless definition of GetAttributedSubstringFromRange.

content/browser/renderer_host/text_input_client_mac.h

Index: content/browser/renderer_host/text_input_client_mac.h
diff --git a/content/browser/renderer_host/text_input_client_mac.h b/content/browser/renderer_host/text_input_client_mac.h
index 84539e53e30137705dd15006d64205d37169ce24..4f03a9315445a3374ed5a0135fed4d7b14569405 100644
--- a/content/browser/renderer_host/text_input_client_mac.h
+++ b/content/browser/renderer_host/text_input_client_mac.h
@@ -57,9 +57,6 @@ class CONTENT_EXPORT TextInputClientMac {
   //
   // Returns NSNotFound if the request times out or is not completed.
   NSUInteger GetCharacterIndexAtPoint(RenderWidgetHost* rwh, gfx::Point point);
-  // Returns nil if the request times out or is completed.
-  NSAttributedString* GetAttributedSubstringFromRange(
-      RenderWidgetHost* rwh, NSRange range);
   // Returns NSZeroRect if the request times out or is not completed. The result
   // is in WebKit coordinates.
   NSRect GetFirstRectForRange(RenderWidgetHost* rwh, NSRange range);