[ios] Moves tab_switcher code out of the ios_internal namespace.

ios/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.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/chrome/browser/ui/tab_switcher/tab_switcher_panel_cell.h"
 
 #include "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/ui/fade_truncated_label.h"
 #import "ios/chrome/browser/ui/image_util.h"
@@ skipping 221 matching lines @@
   _currentPendingSnapshotRequest =
       [[self cache] requestSnapshotForTab:tab
                                  withSize:snapshotSize
                           completionBlock:^(UIImage* image) {
                             DCHECK([NSThread isMainThread]);
                             [weakCell setSnapshot:image];
                             _currentPendingSnapshotRequest = {};
                           }];
 }
 
-- (void)setSessionType:(ios_internal::SessionType)type {
+- (void)setSessionType:(TabSwitcherSessionType)type {
   UIColor* topBarBackgroundColor;
   UIColor* closeButtonTintColor;
   UIColor* textColor;
   UIColor* snapshotBackgroundColor;
-  if (type == ios_internal::SessionType::OFF_THE_RECORD_SESSION) {
+  if (type == TabSwitcherSessionType::OFF_THE_RECORD_SESSION) {
     topBarBackgroundColor = [[MDCPalette greyPalette] tint700];
     closeButtonTintColor = [[MDCPalette greyPalette] tint100];
     textColor = [[MDCPalette greyPalette] tint100];
     snapshotBackgroundColor = [[MDCPalette greyPalette] tint900];
   } else {
     topBarBackgroundColor = [[MDCPalette greyPalette] tint100];
     closeButtonTintColor = [[MDCPalette greyPalette] tint700];
     textColor = [[MDCPalette greyPalette] tint700];
     snapshotBackgroundColor = [UIColor whiteColor];
   }
@@ skipping 133 matching lines @@
   return self;
 }
 
 - (void)setTitle:(NSString*)titleString {
   [_titleLabel setText:titleString];
   [self contentView].accessibilityLabel = titleString;
 }
 
 - (void)setSessionGURL:(GURL const&)gurl
       withBrowserState:(ios::ChromeBrowserState*)browserState {
-  ios_internal::FaviconGetterCompletionBlock block = ^(UIImage* favicon) {
+  TabSwitcherFaviconGetterCompletionBlock block = ^(UIImage* favicon) {
     UIColor* imageDominantColor =
         DominantColorForImage(gfx::Image(favicon), 1.0);
     MDCPalette* dominantPalette =
         [MDCPalette paletteGeneratedFromColor:imageDominantColor];
     UIColor* backgroundColor = dominantPalette.tint300;
     UIColor* textColor =
         [MDFTextAccessibility textColorOnBackgroundColor:backgroundColor
                                          targetTextAlpha:kTitleLabelTextAlpha
                                                     font:[_titleLabel font]];
     UIColor* iconColor =
         [MDFTextAccessibility textColorOnBackgroundColor:backgroundColor
                                          targetTextAlpha:kNewTabIconAlpha
                                                     font:[_titleLabel font]];
     [_raisedButton setBackgroundColor:backgroundColor];
     [_titleLabel setTextColor:textColor];
     [_newTabIcon setTintColor:iconColor];
     [_newTabIcon setAlpha:1.0];
     [_favicon setImage:favicon];
     [UIView animateWithDuration:0.2
                      animations:^{
                        [_raisedButton setAlpha:1.0];
                      }];
   };
   GURL gurlCopy = gurl;
   _faviconObtainer.reset([[NSBlockOperation blockOperationWithBlock:^{
-    ios_internal::GetFavicon(gurlCopy, browserState, block);
+    TabSwitcherGetFavicon(gurlCopy, browserState, block);
   }] retain]);
   NSOperationQueue* operationQueue = [NSOperationQueue mainQueue];
   [operationQueue addOperation:_faviconObtainer];
 }
 
 - (void)setDelegate:(id<SessionCellDelegate>)delegate {
   _delegate = delegate;
 }
 
 - (void)cellPressed {
   [_delegate cellPressed:self];
 }
 
 - (void)prepareForReuse {
   [_newTabIcon setAlpha:0];
   [_faviconObtainer cancel];
   _faviconObtainer.reset();
   [_raisedButton setAlpha:0];
   [_raisedButton resetState];
   [super prepareForReuse];
 }
 
 @end