Support accessible inline text boxes.

content/browser/accessibility/browser_accessibility_cocoa.mm

Index: content/browser/accessibility/browser_accessibility_cocoa.mm
diff --git a/content/browser/accessibility/browser_accessibility_cocoa.mm b/content/browser/accessibility/browser_accessibility_cocoa.mm
index be9ff5b329df1404dec89c851af00ec0b2e8236d..c3f443cb50dedf66db8207387621926ef32edb78 100644
--- a/content/browser/accessibility/browser_accessibility_cocoa.mm
+++ b/content/browser/accessibility/browser_accessibility_cocoa.mm
@@ -353,11 +353,11 @@ NSDictionary* attributeToMethodNameMap = nil;
 // accessibility children of this object.
 - (NSArray*)children {
   if (!children_) {
-    children_.reset([[NSMutableArray alloc]
-        initWithCapacity:browserAccessibility_->child_count()] );
-    for (uint32 index = 0;
-         index < browserAccessibility_->child_count();
-         ++index) {
+    uint32 childCount = browserAccessibility_->child_count();
+    if (browserAccessibility_->IsLeaf())
+      childCount = 0;

[aboxhall, 2013/10/23 16:15:21]

Extra-trivial nit: how about
uint32 childCount = 0;
if (!browserAccessibility_->IsLeaf())
   childCount = browserAccessibility_->child_count()

I realise !IsLeaf() will be the overwhelming majority case, it just seems funny
to be calling child_count() if we're just going to throw it away sometimes.

+    children_.reset([[NSMutableArray alloc] initWithCapacity:childCount]);
+    for (uint32 index = 0; index < childCount; ++index) {
       BrowserAccessibilityCocoa* child =
           browserAccessibility_->GetChild(index)->ToBrowserAccessibilityCocoa();
       if ([child isIgnored])