Migrate WTF::HashMap::get() to ::at()

third_party/WebKit/Source/platform/graphics/gpu/DrawingBufferTestHelpers.h

 // 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.
 
 #include "gpu/command_buffer/common/capabilities.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/gpu/DrawingBuffer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 203 matching lines @@
     memset(mailbox, m_currentMailboxByte, GL_MAILBOX_SIZE_CHROMIUM);
   }
 
   void ProduceTextureDirectCHROMIUM(GLuint texture,
                                     GLenum target,
                                     const GLbyte* mailbox) override {
     ASSERT_EQ(target, drawingBufferTextureTarget());
 
     if (!m_createImageChromiumFail) {
       ASSERT_TRUE(m_textureSizes.contains(texture));
-      m_mostRecentlyProducedSize = m_textureSizes.get(texture);
+      m_mostRecentlyProducedSize = m_textureSizes.at(texture);
     }
   }
 
   void TexImage2D(GLenum target,
                   GLint level,
                   GLint internalformat,
                   GLsizei width,
                   GLsizei height,
                   GLint border,
                   GLenum format,
@@ skipping 157 matching lines @@
   GLbyte m_currentMailboxByte = 0;
   IntSize m_mostRecentlyProducedSize;
   bool m_createImageChromiumFail = false;
   GLuint m_currentImageId = 1;
   HashMap<GLuint, IntSize> m_textureSizes;
   HashMap<GLuint, IntSize> m_imageSizes;
   HashMap<GLuint, GLuint> m_imageToTextureMap;
 };
 
 }  // blink