Remove unused test method

Author: JoeRobich

src/VisualStudio/IntegrationTest/New.IntegrationTests/InProcess/SolutionExplorerInProcess.cs

@@ -510,22 +510,6 @@ public async Task<string> GetFileContentsAsync(string projectName, string relati
             return (solutionDirectory, solutionFileFullPath, userOptionsFile);
         }
 
-        /// <returns>
-        /// If <paramref name="waitForBuildToFinish"/> is <see langword="true"/>, returns the build status line, which generally looks something like this:
-        ///
-        /// <code>
-        /// ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
-        /// </code>
-        ///
-        /// Otherwise, this method does not wait for the build to complete and returns <see langword="null"/>.
-        /// </returns>
-        public async Task BuildSolutionAsync(CancellationToken cancellationToken)
-        {
-            await JoinableTaskFactory.SwitchToMainThreadAsync(cancellationToken);
-
-            await TestServices.Shell.ExecuteCommandAsync(VSConstants.VSStd97CmdID.BuildSln, cancellationToken);
-        }
-
         /// <returns>
         /// The summary line for the build, which generally looks something like this:
         ///