cocoa browser: remove non-material tabstrip support

chrome/browser/ui/cocoa/tabs/tab_strip_view.mm

 // Copyright (c) 2012 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 "chrome/browser/ui/cocoa/tabs/tab_strip_view.h"
 
 #include <cmath>  // floor
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 43 matching lines @@
 }
 
 // Draw the bottom edge of the tab strip. Each tab is responsible for mimicking
 // this bottom border, unless it's the selected tab.
 - (void)drawBottomEdge:(NSRect)dirtyRect {
   NSWindow* window = [self window];
   const ui::ThemeProvider* themeProvider = [window themeProvider];
   if (!themeProvider)
     return;
 
-  if (!ui::MaterialDesignController::IsModeMaterial()) {
-    // First draw the toolbar bitmap, so that theme colors can shine through.
-    NSRect backgroundRect = [self bounds];
-    backgroundRect.size.height = 2 * [self cr_lineWidth];
-    if (NSIntersectsRect(backgroundRect, dirtyRect))
-      [self drawBackground:backgroundRect];
-
-    // Draw the border bitmap, which is partially transparent.
-    NSImage* image = themeProvider->GetNSImageNamed(IDR_TOOLBAR_SHADE_TOP);
-    NSRect borderRect = backgroundRect;
-    borderRect.size.height = [image size].height;
-    if (NSIntersectsRect(borderRect, dirtyRect)) {
-      BOOL focused = [window isMainWindow];
-      NSDrawThreePartImage(borderRect, nil, image, nil, /*vertical=*/ NO,
-                           NSCompositeSourceOver,
-                           focused ?  1.0 : tabs::kImageNoFocusAlpha,
-                           /*flipped=*/ NO);
-    }
-
-    return;
-  }
-
   NSColor* strokeColor;
   if (themeProvider->HasCustomImage(IDR_THEME_TOOLBAR) ||
       themeProvider->HasCustomColor(ThemeProperties::COLOR_TOOLBAR)) {
     // First draw the toolbar bitmap, so that theme colors can shine through.
     NSRect backgroundRect = [self bounds];
     backgroundRect.size.height = [self cr_lineWidth];
     if (NSIntersectsRect(backgroundRect, dirtyRect)) {
       [self drawBackground:backgroundRect];
     }
 
@@ skipping 19 matching lines @@
   NSRect borderRect = NSMakeRect(0.0, 0.0, self.bounds.size.width,
       [self cr_lineWidth]);
   NSRectFillUsingOperation(NSIntersectionRect(dirtyRect, borderRect),
                            NSCompositeSourceOver);
 }
 
 - (void)drawRect:(NSRect)dirtyRect {
   const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
   bool hasCustomThemeImage = themeProvider &&
       themeProvider->HasCustomImage(IDR_THEME_FRAME);
-  bool isModeMaterial = ui::MaterialDesignController::IsModeMaterial();
   BOOL supportsVibrancy = [self visualEffectView] != nil;
   BOOL isMainWindow = [[self window] isMainWindow];
 
   // If in Material Design mode, decrease the tabstrip background's translucency
   // by overlaying it with a partially-transparent gray (but only if not themed,
   // and not being used to drag tabs between browser windows). The gray is
   // somewhat opaque for Incognito mode, very opaque for non-Incognito mode, and
   // completely opaque when the window is not active.
-  if (themeProvider && !hasCustomThemeImage && isModeMaterial &&
-      !inATabDraggingOverlayWindow_) {
+  if (themeProvider && !hasCustomThemeImage && !inATabDraggingOverlayWindow_) {
     NSColor* theColor = nil;
     if (isMainWindow) {
       if (supportsVibrancy &&
           !themeProvider->HasCustomColor(ThemeProperties::COLOR_FRAME)) {
         theColor = themeProvider->GetNSColor(
             ThemeProperties::COLOR_FRAME_VIBRANCY_OVERLAY);
       } else if (!supportsVibrancy && themeProvider->InIncognitoMode()) {
         theColor = [NSColor colorWithSRGBRed:20 / 255.
                                        green:22 / 255.
                                         blue:24 / 255.
@@ skipping 218 matching lines @@
 
 - (NewTabButton*)getNewTabButton {
   return newTabButton_;
 }
 
 - (void)setNewTabButton:(NewTabButton*)button {
   newTabButton_.reset([button retain]);
 }
 
 - (NSVisualEffectView*)visualEffectView {
-  // NSVisualEffectView is only used in Material Design, and only available on
-  // OS X 10.10 and higher.
-  if (!ui::MaterialDesignController::IsModeMaterial() ||
-      !base::mac::IsAtLeastOS10_10()) {
+  // NSVisualEffectView is only available on OS X 10.10 and higher.
+  if (!base::mac::IsAtLeastOS10_10())
     return nil;
-  }
 
   NSView* rootView = [[[self window] contentView] superview];
   Class nsVisualEffectViewClass = NSClassFromString(@"NSVisualEffectView");
   DCHECK(nsVisualEffectViewClass);
   for (NSView* view in [rootView subviews]) {
     if ([view isKindOfClass:nsVisualEffectViewClass]) {
       return base::mac::ObjCCast<NSVisualEffectView>(view);
     }
   }
   return nil;
@@ skipping 54 matching lines @@
   if (visualEffectsDisabledForFullscreen_ ||
       themeProvider->HasCustomImage(IDR_THEME_FRAME) ||
       themeProvider->HasCustomColor(ThemeProperties::COLOR_FRAME)) {
     [visualEffectView setState:NSVisualEffectStateInactive];
   } else {
     [visualEffectView setState:NSVisualEffectStateFollowsWindowActiveState];
   }
 }
 
 @end