[Mac] Fix aesthetic issues with themes given the new TopChrome changes....

chrome/browser/cocoa/styled_text_field_cell.mm

Index: chrome/browser/cocoa/styled_text_field_cell.mm
===================================================================
--- chrome/browser/cocoa/styled_text_field_cell.mm	(revision 55783)
+++ chrome/browser/cocoa/styled_text_field_cell.mm	(working copy)
@@ -129,7 +129,8 @@
 
   // Paint button background image if there is one (otherwise the border won't
   // look right).
-  ThemeProvider* themeProvider = [[controlView window] themeProvider];
+  BrowserThemeProvider* themeProvider =
+      static_cast<BrowserThemeProvider*>([[controlView window] themeProvider]);
   if (themeProvider) {
     NSColor* backgroundImageColor =
         themeProvider->GetNSImageColorNamed(IDR_THEME_BUTTON_BACKGROUND, false);
@@ -171,8 +172,11 @@
   }
 
   // Draw optional bezel below bottom stroke.
-  if ([self shouldDrawBezel]) {
-    [[NSColor colorWithCalibratedWhite:0.96 alpha:1.0] set];
+  if ([self shouldDrawBezel] && themeProvider &&
+      themeProvider->UsingDefaultTheme()) {
+
+    [themeProvider->GetNSColor(
+        BrowserThemeProvider::COLOR_TOOLBAR_BEZEL, true) set];
     NSRect bezelRect = NSMakeRect(cellFrame.origin.x,
                                   NSMaxY(cellFrame) - 0.5,
                                   NSWidth(cellFrame),