Eliminate InfoBarTabHelper. Make InfoBarService a concrete class.

chrome/browser/managed_mode/managed_mode_navigation_observer.cc

Index: chrome/browser/managed_mode/managed_mode_navigation_observer.cc
===================================================================
--- chrome/browser/managed_mode/managed_mode_navigation_observer.cc	(revision 195254)
+++ chrome/browser/managed_mode/managed_mode_navigation_observer.cc	(working copy)
@@ -138,7 +138,7 @@
 }
 
 bool ManagedModeWarningInfobarDelegate::Accept() {
-  GoBackToSafety(owner()->GetWebContents());
+  GoBackToSafety(owner()->web_contents());
 
   return false;
 }
@@ -156,7 +156,7 @@
 
 void ManagedModeWarningInfobarDelegate::InfoBarDismissed() {
   ManagedModeNavigationObserver* observer =
-      ManagedModeNavigationObserver::FromWebContents(owner()->GetWebContents());
+      ManagedModeNavigationObserver::FromWebContents(owner()->web_contents());
   observer->WarnInfobarDismissed();
 }
 
@@ -216,8 +216,7 @@
 
 bool ManagedModePreviewInfobarDelegate::Accept() {
   ManagedModeNavigationObserver* observer =
-      ManagedModeNavigationObserver::FromWebContents(
-          owner()->GetWebContents());
+      ManagedModeNavigationObserver::FromWebContents(owner()->web_contents());
   UMA_HISTOGRAM_ENUMERATION("ManagedMode.PreviewInfobarCommand",
                             INFOBAR_ACCEPT,
                             INFOBAR_HISTOGRAM_BOUNDING_VALUE);
@@ -227,12 +226,11 @@
 
 bool ManagedModePreviewInfobarDelegate::Cancel() {
   ManagedModeNavigationObserver* observer =
-      ManagedModeNavigationObserver::FromWebContents(
-          owner()->GetWebContents());
+      ManagedModeNavigationObserver::FromWebContents(owner()->web_contents());
   UMA_HISTOGRAM_ENUMERATION("ManagedMode.PreviewInfobarCommand",
                             INFOBAR_CANCEL,
                             INFOBAR_HISTOGRAM_BOUNDING_VALUE);
-  GoBackToSafety(owner()->GetWebContents());
+  GoBackToSafety(owner()->web_contents());
   observer->ClearObserverState();
   return false;
 }
@@ -245,8 +243,7 @@
 
 void ManagedModePreviewInfobarDelegate::InfoBarDismissed() {
   ManagedModeNavigationObserver* observer =
-      ManagedModeNavigationObserver::FromWebContents(
-          owner()->GetWebContents());
+      ManagedModeNavigationObserver::FromWebContents(owner()->web_contents());
   observer->PreviewInfobarDismissed();
 }