Reland of place string::find(prefix) == 0 pattern with base::StartsWith().

chrome/browser/profiles/profile_avatar_icon_util.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 "chrome/browser/profiles/profile_avatar_icon_util.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/files/file_util.h"
 #include "base/format_macros.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "skia/ext/image_operations.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkScalar.h"
@@ skipping 454 matching lines @@
   CHECK_NE(index, kPlaceholderAvatarIndex);
   return GetDefaultAvatarIconResourceInfo(index)->label_id;
 }
 
 bool IsDefaultAvatarIconIndex(size_t index) {
   return index < kDefaultAvatarIconsCount;
 }
 
 bool IsDefaultAvatarIconUrl(const std::string& url, size_t* icon_index) {
   DCHECK(icon_index);
-  if (url.find(kDefaultUrlPrefix) != 0)
+  if (!base::StartsWith(url, kDefaultUrlPrefix, base::CompareCase::SENSITIVE))
     return false;
 
   int int_value = -1;
   if (base::StringToInt(base::StringPiece(url.begin() +
                                           strlen(kDefaultUrlPrefix),
                                           url.end()),
                         &int_value)) {
     if (int_value < 0 ||
         int_value >= static_cast<int>(kDefaultAvatarIconsCount))
       return false;
@@ skipping 62 matching lines @@
     avatar_info->SetString(
         "label", l10n_util::GetStringUTF16(
                      profiles::GetDefaultAvatarLabelResourceIDAtIndex(i)));
 
     avatars->Append(std::move(avatar_info));
   }
   return avatars;
 }
 
 }  // namespace profiles