Make EarlGrey matchers compliant with Chromium style.

ios/chrome/browser/ui/sync/sync_fake_server_egtest.mm

 // Copyright 2016 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 <EarlGrey/EarlGrey.h>
 #import <XCTest/XCTest.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/bookmarks/browser/titled_url_match.h"
@@ skipping 57 matching lines @@
       grey_allOf(grey_accessibilityID(kSettingsSignInCellId),
                  grey_sufficientlyVisible(), nil);
   [[EarlGrey selectElementWithMatcher:matcher] performAction:grey_tap()];
 }
 
 // Signs in the identity for the specific |userEmail|. This is performed via the
 // UI and must be called from the NTP.
 void SignInIdentity(NSString* userEmail) {
   OpenSignInFromSettings();
   [[EarlGrey
-      selectElementWithMatcher:chrome_test_util::buttonWithAccessibilityLabel(
+      selectElementWithMatcher:chrome_test_util::ButtonWithAccessibilityLabel(
                                    userEmail)] performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:
-                 chrome_test_util::buttonWithAccessibilityLabelId(
+                 chrome_test_util::ButtonWithAccessibilityLabelId(
                      IDS_IOS_ACCOUNT_CONSISTENCY_SETUP_SIGNIN_BUTTON)]
       performAction:grey_tap()];
   [[EarlGrey selectElementWithMatcher:
-                 chrome_test_util::buttonWithAccessibilityLabelId(
+                 chrome_test_util::ButtonWithAccessibilityLabelId(
                      IDS_IOS_ACCOUNT_CONSISTENCY_CONFIRMATION_OK_BUTTON)]
       performAction:grey_tap()];
   [[EarlGrey
-      selectElementWithMatcher:chrome_test_util::buttonWithAccessibilityLabelId(
+      selectElementWithMatcher:chrome_test_util::ButtonWithAccessibilityLabelId(
                                    IDS_DONE)] performAction:grey_tap()];
 }
 
 // Waits for sync to be initialized or not, based on |isSyncInitialized| and
 // fails with a GREYAssert if that condition is never met.
 void AssertSyncInitialized(bool is_initialized) {
   ConditionBlock condition = ^{
     return chrome_test_util::IsSyncInitialized() == is_initialized;
   };
   GREYAssert(
@@ skipping 528 matching lines @@
 
   // Verify the correct number of bookmarks exist.
   base::string16 matchString = base::SysNSStringToUTF16(title);
   std::vector<bookmarks::TitledUrlMatch> matches;
   bookmarkModel->GetBookmarksMatching(matchString, 50, &matches);
   const size_t count = matches.size();
   GREYAssertEqual(expectedCount, count, @"Unexpected number of bookmarks");
 }
 
 @end