[iOS] Fix static analyzer warning in web controller.

ios/web/web_state/ui/crw_web_controller_container_view.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/ui/crw_web_controller_container_view.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
 
 #pragma mark - CRWToolbarContainerView
@@ skipping 99 matching lines @@
         UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
   }
   return self;
 }
 
 #pragma mark Accessors
 
 - (void)setToolbarContainerView:(CRWToolbarContainerView*)toolbarContainerView {
   if (![_toolbarContainerView isEqual:toolbarContainerView]) {
     [_toolbarContainerView removeFromSuperview];
-    _toolbarContainerView.reset(toolbarContainerView);
+    _toolbarContainerView.reset([toolbarContainerView retain]);
     [self addSubview:_toolbarContainerView];
   }
 }
 
 - (UIView*)toolbarContainerView {
   return _toolbarContainerView.get();
 }
 
 #pragma mark Layout
 
 - (void)layoutSubviews {
   [super layoutSubviews];
 
   if (self.toolbarContainerView) {
     [self bringSubviewToFront:self.toolbarContainerView];
     CGSize toolbarContainerSize =
         [self.toolbarContainerView sizeThatFits:self.bounds.size];
     self.toolbarContainerView.frame =
         CGRectMake(CGRectGetMinX(self.bounds),
                    CGRectGetMaxY(self.bounds) - toolbarContainerSize.height,
                    toolbarContainerSize.width, toolbarContainerSize.height);
   }
 }
 
 #pragma mark Toolbars
 
 - (void)addToolbar:(UIView*)toolbar {
   // Create toolbar container if necessary.
   if (!self.toolbarContainerView) {
-    self.toolbarContainerView =
-        [[CRWToolbarContainerView alloc] initWithFrame:CGRectZero];
+    self.toolbarContainerView = [
+        [[CRWToolbarContainerView alloc] initWithFrame:CGRectZero] autorelease];
   }
   // Add the toolbar to the container.
   [self.toolbarContainerView addToolbar:toolbar];
   [self setNeedsLayout];
 }
 
 - (void)addToolbars:(NSArray*)toolbars {
   DCHECK(toolbars);
   for (UIView* toolbar in toolbars)
     [self addToolbar:toolbar];
 }
 
 - (void)removeToolbar:(UIView*)toolbar {
   // Remove the toolbar from the container view.
   [self.toolbarContainerView removeToolbar:toolbar];
   // Reset the container if there are no more toolbars.
   if ([self.toolbarContainerView.toolbars count])
     [self setNeedsLayout];
   else
     self.toolbarContainerView = nil;
 }
 
 - (void)removeAllToolbars {
   // Resetting the property will remove the toolbars from the hierarchy.
   self.toolbarContainerView = nil;
 }
 
 @end