webapps: utilize manifest theme colors

content/browser/manifest/manifest_manager_host.cc

 // Copyright 2014 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.
 
 #include "content/browser/manifest/manifest_manager_host.h"
 
 #include "base/stl_util.h"
 #include "content/common/manifest_manager_messages.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 121 matching lines @@
     if (!related_application.url.is_valid())
       related_application.url = GURL();
     related_application.id =
         base::NullableString16(related_application.id.string().substr(
                                    0, Manifest::kMaxIPCStringLength),
                                related_application.id.is_null());
   }
   // theme_color is a 32 bit unsigned integer with a 64 bit integer simply
   // being used to encode an error occuring. Therefore, any value outside the
   // range of an unsigned 32 bit integer is invalid.
-  if (manifest.theme_color < 0 || manifest.theme_color > 0xFFFFFFFF)
+  if (manifest.theme_color < std::numeric_limits<int32_t>::min() ||
+      manifest.theme_color > std::numeric_limits<int32_t>::max())
     manifest.theme_color = Manifest::kInvalidOrMissingThemeColor;
 
   callback->Run(manifest);
   callbacks->Remove(request_id);
   if (callbacks->IsEmpty()) {
     delete callbacks;
     pending_callbacks_.erase(render_frame_host);
   }
 }
 
 } // namespace content