[sync] Scope BrowserListRouterHelper to browsers with a matching profile

chrome/browser/sync/sessions/browser_list_router_helper.cc

Index: chrome/browser/sync/sessions/browser_list_router_helper.cc
diff --git a/chrome/browser/sync/sessions/browser_list_router_helper.cc b/chrome/browser/sync/sessions/browser_list_router_helper.cc
index 2b551df9d6f5e6bb4e3dd6292184af4d50f162eb..30de55926d18de5a4269f2690aac9bc9e0fbf4dc 100644
--- a/chrome/browser/sync/sessions/browser_list_router_helper.cc
+++ b/chrome/browser/sync/sessions/browser_list_router_helper.cc
@@ -12,27 +12,41 @@
 namespace sync_sessions {
 
 BrowserListRouterHelper::BrowserListRouterHelper(
-    SyncSessionsWebContentsRouter* router)
-    : router_(router) {
+    SyncSessionsWebContentsRouter* router,
+    Profile* profile)
+    : router_(router), profile_(profile) {
   BrowserList* browser_list = BrowserList::GetInstance();
-  for (Browser* browser : *browser_list)
-    browser->tab_strip_model()->AddObserver(this);
+  for (Browser* browser : *browser_list) {
+    if (browser->profile() == profile_) {
+      browser->tab_strip_model()->AddObserver(this);
+      attached_browsers_.insert(browser);
+    }
+  }
   browser_list->AddObserver(this);
 }
 
 BrowserListRouterHelper::~BrowserListRouterHelper() {
-  BrowserList* browser_list = BrowserList::GetInstance();
-  for (Browser* browser : *browser_list)
-    browser->tab_strip_model()->RemoveObserver(this);
+  for (Browser* browser : attached_browsers_) {
+    if (browser->profile() == profile_) {
+      browser->tab_strip_model()->RemoveObserver(this);
+    }
+  }
+
   BrowserList::GetInstance()->RemoveObserver(this);
 }
 
 void BrowserListRouterHelper::OnBrowserAdded(Browser* browser) {
-  browser->tab_strip_model()->AddObserver(this);
+  if (browser->profile() == profile_) {
+    browser->tab_strip_model()->AddObserver(this);
+    attached_browsers_.insert(browser);
+  }
 }
 
 void BrowserListRouterHelper::OnBrowserRemoved(Browser* browser) {
-  browser->tab_strip_model()->RemoveObserver(this);
+  if (browser->profile() == profile_) {
+    browser->tab_strip_model()->RemoveObserver(this);
+    attached_browsers_.erase(browser);
+  }
 }
 
 void BrowserListRouterHelper::TabInsertedAt(TabStripModel* model,