Reuse AXPlatformNodeBase::Init to set owner.

BUG=703369

Review-Url: https://codereview.chromium.org/2872983002
Cr-Commit-Position: refs/heads/master@{#471080}

content/browser/accessibility/browser_accessibility_com_win.cc

@@ -4091,6 +4091,11 @@ void BrowserAccessibilityComWin::Destroy() {
   AXPlatformNodeWin::Destroy();
 }
 
+void BrowserAccessibilityComWin::Init(ui::AXPlatformNodeDelegate* delegate) {
+  owner_ = static_cast<BrowserAccessibilityWin*>(delegate);
+  AXPlatformNodeBase::Init(delegate);
+}
+
 std::vector<base::string16> BrowserAccessibilityComWin::ComputeTextAttributes()
     const {
   std::vector<base::string16> attributes;

content/browser/accessibility/browser_accessibility_com_win.h

@@ -24,6 +24,7 @@
 #include "third_party/isimpledom/ISimpleDOMDocument.h"
 #include "third_party/isimpledom/ISimpleDOMNode.h"
 #include "third_party/isimpledom/ISimpleDOMText.h"
+#include "ui/accessibility/platform/ax_platform_node_delegate.h"
 #include "ui/accessibility/platform/ax_platform_node_win.h"
 
 namespace ui {
@@ -751,6 +752,7 @@ class __declspec(uuid("562072fe-3390-43b1-9e2c-dd4118f5ac79"))
   // AXPlatformNode overrides
   //
   void Destroy() override;
+  void Init(ui::AXPlatformNodeDelegate* delegate) override;
 
   // Returns the IA2 text attributes for this object.
   std::vector<base::string16> ComputeTextAttributes() const;

content/browser/accessibility/browser_accessibility_win.cc

@@ -20,7 +20,6 @@ BrowserAccessibilityWin::BrowserAccessibilityWin() {
   DCHECK(SUCCEEDED(hr));
 
   browser_accessibility_com_->AddRef();
-  browser_accessibility_com_->SetOwner(this);
 
   // Set the delegate to us
   browser_accessibility_com_->Init(this);