Revert of Migrate BrowserAccessibility windows unique id handling to AXPlatformNodeWin.

content/browser/accessibility/browser_accessibility.cc

Index: content/browser/accessibility/browser_accessibility.cc
diff --git a/content/browser/accessibility/browser_accessibility.cc b/content/browser/accessibility/browser_accessibility.cc
index 6a01f3d471f6e593c6b37446d7a636e492eeb9c6..3824914ff94178face04b07104e45331ba0bf2a0 100644
--- a/content/browser/accessibility/browser_accessibility.cc
+++ b/content/browser/accessibility/browser_accessibility.cc
@@ -17,10 +17,19 @@
 #include "content/common/accessibility_messages.h"
 #include "ui/accessibility/ax_role_properties.h"
 #include "ui/accessibility/ax_text_utils.h"
+#include "ui/accessibility/platform/ax_platform_unique_id.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 namespace content {
+
+namespace {
+
+// Map from unique_id to BrowserAccessibility
+using UniqueIDMap = base::hash_map<int32_t, BrowserAccessibility*>;
+base::LazyInstance<UniqueIDMap>::DestructorAtExit g_unique_id_map =
+    LAZY_INSTANCE_INITIALIZER;
+}
 
 #if !defined(PLATFORM_HAS_NATIVE_ACCESSIBILITY_IMPL)
 // static
@@ -30,9 +39,24 @@
 #endif
 
 BrowserAccessibility::BrowserAccessibility()
-    : manager_(nullptr), node_(nullptr) {}
+    : manager_(nullptr),
+      node_(nullptr),
+      unique_id_(ui::GetNextAXPlatformNodeUniqueId()) {
+  g_unique_id_map.Get()[unique_id_] = this;
+}
 
 BrowserAccessibility::~BrowserAccessibility() {
+  if (unique_id_)
+    g_unique_id_map.Get().erase(unique_id_);
+}
+
+// static
+BrowserAccessibility* BrowserAccessibility::GetFromUniqueID(int32_t unique_id) {
+  auto iter = g_unique_id_map.Get().find(unique_id);
+  if (iter == g_unique_id_map.Get().end())
+    return nullptr;
+
+  return iter->second;
 }
 
 void BrowserAccessibility::Init(BrowserAccessibilityManager* manager,
@@ -549,6 +573,10 @@
   node_ = NULL;
   manager_ = NULL;
 
+  if (unique_id_)
+    g_unique_id_map.Get().erase(unique_id_);
+  unique_id_ = 0;
+
   NativeReleaseReference();
 }