Do not submit: high level overview patch.

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 96368a80078d98f1cca9278ce946e9c4df377441..dee16cfcee2dbd9b39726c9a3450de735b8799bc 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -24,7 +24,6 @@
 #include "chrome/browser/ui/browser_tab_contents.h"
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 #include "chrome/browser/ui/prefs/prefs_tab_helper.h"
-#include "chrome/browser/ui/sync/tab_contents_synced_tab_delegate.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper.h"
 #include "chrome/browser/ui/toolbar/toolbar_model_impl.h"
 #include "components/autofill/browser/autofill_external_delegate.h"
@@ -57,10 +56,6 @@ void BrowserTabContents::AttachTabHelpers(WebContents* contents) {
   // Set the view type.
   extensions::SetViewType(contents, extensions::VIEW_TYPE_TAB_CONTENTS);
 
-  // SessionTabHelper comes first because it sets up the tab ID, and other
-  // helpers may rely on that.
-  SessionTabHelper::CreateForWebContents(contents);
-
   AlternateErrorPageTabObserver::CreateForWebContents(contents);
   autofill::TabAutofillManagerDelegate::CreateForWebContents(contents);
   autofill::AutofillManager::CreateForWebContentsAndDelegate(
@@ -86,7 +81,6 @@ void BrowserTabContents::AttachTabHelpers(WebContents* contents) {
   PrefsTabHelper::CreateForWebContents(contents);
   prerender::PrerenderTabHelper::CreateForWebContents(contents);
   SSLTabHelper::CreateForWebContents(contents);
-  TabContentsSyncedTabDelegate::CreateForWebContents(contents);
   TabSpecificContentSettings::CreateForWebContents(contents);
   TranslateTabHelper::CreateForWebContents(contents);
   WindowAndroidHelper::CreateForWebContents(contents);
@@ -103,13 +97,10 @@ WebContents* TabAndroid::InitWebContentsFromView(JNIEnv* env,
   DCHECK(content_view_core);
   WebContents* web_contents = content_view_core->GetWebContents();
   DCHECK(web_contents);
-  InitTabHelpers(web_contents);
   return web_contents;
 }
 
-TabAndroid::TabAndroid(JNIEnv* env, jobject obj)
-    : tab_id_(-1),
-      weak_java_tab_(env, obj) {
+TabAndroid::TabAndroid(JNIEnv* env, jobject obj) : weak_java_tab_(env, obj) {
   Java_TabBase_setNativePtr(env, obj, reinterpret_cast<jint>(this));
 }