Move some accessibility methods, enums and interfaces into the content/public API.

content/renderer/accessibility/renderer_accessibility_browsertest.cc

Index: content/renderer/accessibility/renderer_accessibility_browsertest.cc
diff --git a/content/renderer/accessibility/renderer_accessibility_browsertest.cc b/content/renderer/accessibility/renderer_accessibility_browsertest.cc
index 304822e04dd5d0c797127c2602b38f5073434bf1..6c14fc3f003baf9a58f7f92a40b4d67d7574304e 100644
--- a/content/renderer/accessibility/renderer_accessibility_browsertest.cc
+++ b/content/renderer/accessibility/renderer_accessibility_browsertest.cc
@@ -6,6 +6,7 @@
 #include "content/common/accessibility_messages.h"
 #include "content/common/accessibility_node_data.h"
 #include "content/common/view_messages.h"
+#include "content/public/common/accessibility_mode.h"
 #include "content/public/test/render_view_test.h"
 #include "content/renderer/render_view_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -49,7 +50,7 @@ class RendererAccessibilityTest : public RenderViewTest {
 };
 
 TEST_F(RendererAccessibilityTest, EditableTextModeFocusNotifications) {
-  SetMode(AccessibilityModeEditableTextOnly);
+  SetMode(ACCESSIBILITY_MODE_EDITABLE_TEXT_ONLY);
 
   // Set a minimum size and give focus so simulated events work.
   view()->webwidget()->resize(WebKit::WebSize(500, 500));