[Mac] Strip newlines from paste.

chrome/browser/cocoa/autocomplete_text_field_editor.h

Index: chrome/browser/cocoa/autocomplete_text_field_editor.h
diff --git a/chrome/browser/cocoa/autocomplete_text_field_editor.h b/chrome/browser/cocoa/autocomplete_text_field_editor.h
index 1d4d0735d699e1f6ee5346200347a28b260667a3..640bb9bc95a4f871c3a1cb8b65e073e05289467b 100644
--- a/chrome/browser/cocoa/autocomplete_text_field_editor.h
+++ b/chrome/browser/cocoa/autocomplete_text_field_editor.h
@@ -4,6 +4,16 @@
 
 #import <Cocoa/Cocoa.h>
 
+@protocol AutocompleteTextFieldEditorDelegateMethods
+
+// Delegate -paste: implementation to the field being edited.  If the
+// delegate returns YES, or does not implement the method, NSTextView
+// is called to handle the paste.  The delegate can block the paste
+// (or handle it internally) by returning NO.
+- (BOOL)textShouldPaste:(NSText*)fieldEditor;
+
+@end
+
 // Field editor used for the autocomplete field.
 @interface AutocompleteTextFieldEditor : NSTextView {
 }
@@ -14,4 +24,9 @@
 
 // Same as above, note that this calls through to performCopy.
 - (void)performCut:(NSPasteboard*)pb;
+
+// Called by -paste: to decide whether to forward to superclass.
+// Exposed for unit testing.
+- (BOOL)shouldPaste;
+
 @end