Improve formatting of accessibility tests that dump the tree.

content/browser/accessibility/dump_accessibility_tree_helper_mac.mm

Index: content/browser/accessibility/dump_accessibility_tree_helper_mac.mm
diff --git a/content/browser/accessibility/dump_accessibility_tree_helper_mac.mm b/content/browser/accessibility/dump_accessibility_tree_helper_mac.mm
index 949fe9c7932d5a329ddf4ac1586c35555466b42b..6105adc55f7e9dee5e95ddb8d58e43b8ba9bac4f 100644
--- a/content/browser/accessibility/dump_accessibility_tree_helper_mac.mm
+++ b/content/browser/accessibility/dump_accessibility_tree_helper_mac.mm
@@ -13,13 +13,16 @@
 
 void DumpAccessibilityTreeHelper::Initialize() {}
 
-string16 DumpAccessibilityTreeHelper::ToString(BrowserAccessibility* node) {
+string16 DumpAccessibilityTreeHelper::ToString(BrowserAccessibility* node,
+                                               char* prefix) {
   BrowserAccessibilityCocoa* cocoa_node = node->toBrowserAccessibilityCocoa();
-  NSString* dump = [NSString stringWithFormat:@"%@|%@|%@|%@",
-      [cocoa_node role],
-      [cocoa_node subrole],
-      [cocoa_node title],
-      [cocoa_node value]];
+  NSString* dump =
+      [NSString stringWithFormat:@"%s%@ subrole=%@ title='%@' value='%@'\n",
+       prefix,
+       [cocoa_node role],
+       [cocoa_node subrole],
+       [cocoa_node title],
+       [cocoa_node value]];
   std::string tempVal = [dump cStringUsingEncoding:NSUTF8StringEncoding];
 
   return UTF8ToUTF16(tempVal);
@@ -34,7 +37,3 @@ const FilePath::StringType DumpAccessibilityTreeHelper::GetExpectedFileSuffix()
     const {
   return FILE_PATH_LITERAL("-expected-mac.txt");
 }
-
-const string16 DumpAccessibilityTreeHelper::GetLineEnding() const {
-  return UTF8ToUTF16("\n");
-}