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

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
index 449c7e9fba417fd7d9807a7ebf17ec3eda2949d2..514c3cb1d162769484baba16c9488dcc0624f467 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
@@ -203,9 +203,9 @@ WebGLRenderingContextBase* WebGLRenderingContextBase::oldestEvictedContext() {
   WebGLRenderingContextBase* candidate = nullptr;
   int generation = -1;
   for (WebGLRenderingContextBase* context : forciblyEvictedContexts().keys()) {
-    if (!candidate || forciblyEvictedContexts().get(context) < generation) {
+    if (!candidate || forciblyEvictedContexts().at(context) < generation) {
       candidate = context;
-      generation = forciblyEvictedContexts().get(context);
+      generation = forciblyEvictedContexts().at(context);
     }
   }