[Mac] Update tab audio icon to Material Design and tweak close box color.

chrome/browser/ui/cocoa/hover_close_button.mm

Index: chrome/browser/ui/cocoa/hover_close_button.mm
diff --git a/chrome/browser/ui/cocoa/hover_close_button.mm b/chrome/browser/ui/cocoa/hover_close_button.mm
index ba5e9be34b1c3d3fd4b18b443f9f27521aafc34e..1797e94166c0dfa5709e0d9edc59bd93e586bcb2 100644
--- a/chrome/browser/ui/cocoa/hover_close_button.mm
+++ b/chrome/browser/ui/cocoa/hover_close_button.mm
@@ -9,6 +9,7 @@
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
+#import "chrome/browser/ui/cocoa/tabs/tab_controller.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 #include "chrome/grit/generated_resources.h"
 #include "grit/components_strings.h"
@@ -18,6 +19,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/color_palette.h"
 #include "ui/gfx/image/image_skia_util_mac.h"
 #include "ui/gfx/paint_vector_icon.h"
 #include "ui/gfx/vector_icons_public.h"
@@ -157,6 +159,26 @@ NSString* const kFadeOutValueKeyPath = @"fadeOutValue";
   return base::mac::ObjCCast<TabView>([self superview]);
 }
 
+- (SkColor)iconColor {
+  if ([[self window] hasDarkTheme]) {
+    return SkColorSetARGB(0xFF, 0xC4, 0xC4, 0xC4);
+  }
+
+  const ui::ThemeProvider* themeProvider = [[self window] themeProvider];
+  if (themeProvider) {
+    TabView* tabView = [self tabView];
+    bool use_active_tab_text_color = !tabView || [tabView isActiveTab];
+
+    const SkColor titleColor = use_active_tab_text_color ?
+        themeProvider->GetColor(ThemeProperties::COLOR_TAB_TEXT) :
+        themeProvider->GetColor(ThemeProperties::COLOR_BACKGROUND_TAB_TEXT);
+    return SkColorSetA(titleColor, 0xA0);
+  }
+
+  // Return the default COLOR_TAB_TEXT color.
+  return SkColorSetARGB(0xA0, 0x00, 0x00, 0x00);
+}
+
 - (NSImage*)imageForHoverState:(HoverState)hoverState {
   int imageID = IDR_CLOSE_1;
 
@@ -177,33 +199,12 @@ NSString* const kFadeOutValueKeyPath = @"fadeOutValue";
   }
 
   gfx::VectorIconId vectorIconID;
-  SkColor vectorIconColor;
-  const ui::ThemeProvider* themeProvider = nullptr;
-  TabView* tabView;
+  SkColor vectorIconColor = gfx::kPlaceholderColor;
 
   switch (hoverState) {
     case kHoverStateNone:
       vectorIconID = gfx::VectorIconId::TAB_CLOSE_NORMAL;
-      // Determine the vector icon color, which for this icon is the color
-      // of the "x".
-      themeProvider = [[self window] themeProvider];
-      if (themeProvider) {
-        if (themeProvider->InIncognitoMode()) {
-          vectorIconColor = SkColorSetARGB(0xFF, 0xC4, 0xC4, 0xC4);
-        } else {
-          tabView = [self tabView];
-          bool use_active_tab_text_color = !tabView || [tabView isActiveTab];
-
-          const SkColor titleColor = use_active_tab_text_color ?
-              themeProvider->GetColor(ThemeProperties::COLOR_TAB_TEXT) :
-              themeProvider->GetColor(
-                  ThemeProperties::COLOR_BACKGROUND_TAB_TEXT);
-          vectorIconColor = SkColorSetA(titleColor, 0xA0);
-        }
-      } else {
-        // 0x000000 is the default COLOR_TAB_TEXT color.
-        vectorIconColor = SkColorSetARGB(0xA0, 0x00, 0x00, 0x00);
-      }
+      vectorIconColor = [self iconColor];
       break;
     case kHoverStateMouseOver:
       // For mouse over, the icon color is the fill color of the circle.