Fix some issues discovered by rubocop.

fix failures due to:
- misformatting of wrapped lines
- a superflous block (and temp dir creation) due to overzealous cut & paste.

spec/googleauth/get_application_default_spec.rb

@@ -144,7 +144,6 @@ describe '#get_application_default' do
     it 'succeeds with system default file' do
       ENV.delete(@var_name) unless ENV[@var_name].nil?
       FakeFS do
-        Dir.mktmpdir do |dir|
         key_path = File.join('/etc/google/auth/', CREDENTIALS_FILE_NAME)
         FileUtils.mkdir_p(File.dirname(key_path))
         File.write(key_path, cred_json_text)
@@ -152,7 +151,6 @@ describe '#get_application_default' do
         File.delete(key_path)
       end
     end
-    end
 
     it 'succeeds if environment vars are valid' do
       ENV.delete(@var_name) unless ENV[@var_name].nil? # no env var

spec/googleauth/service_account_spec.rb

@@ -242,14 +242,13 @@ describe Google::Auth::ServiceAccountCredentials do
 
     it 'is nil if no file exists' do
       FakeFS do
-        expect(ServiceAccountCredentials.from_system_default_path(@scope)).
+        expect(ServiceAccountCredentials.from_system_default_path(@scope))
-          to be_nil
+          .to be_nil
       end
     end
 
     it 'successfully loads the file when it is present' do
       FakeFS do
-        Dir.mktmpdir do |dir|
         FileUtils.mkdir_p(File.dirname(@path))
         File.write(@path, cred_json_text)
         expect(@clz.from_system_default_path(@scope)).to_not be_nil
@@ -257,7 +256,6 @@ describe Google::Auth::ServiceAccountCredentials do
       end
     end
   end
-  end
 end
 
 describe Google::Auth::ServiceAccountJwtHeaderCredentials do

spec/googleauth/user_refresh_spec.rb

@@ -196,8 +196,8 @@ describe Google::Auth::UserRefreshCredentials do
 
     it 'is nil if no file exists' do
       FakeFS do
-        expect(UserRefreshCredentials.from_system_default_path(@scope)).
+        expect(UserRefreshCredentials.from_system_default_path(@scope))
-          to be_nil
+          .to be_nil
       end
     end
 
@@ -205,20 +205,17 @@ describe Google::Auth::UserRefreshCredentials do
       needed = %w(client_id client_secret refresh_token)
       needed.each do |missing|
         FakeFS do
-          Dir.mktmpdir do |dir|
           FileUtils.mkdir_p(File.dirname(@path))
           File.write(@path, cred_json_text(missing))
-            expect { @clz.from_system_default_path(@scope) }.
+          expect { @clz.from_system_default_path(@scope) }
-              to raise_error RuntimeError
+            .to raise_error RuntimeError
           File.delete(@path)
         end
       end
     end
-    end
 
     it 'successfully loads the file when it is present' do
       FakeFS do
-        Dir.mktmpdir do |dir|
         FileUtils.mkdir_p(File.dirname(@path))
         File.write(@path, cred_json_text)
         expect(@clz.from_system_default_path(@scope)).to_not be_nil
@@ -226,5 +223,4 @@ describe Google::Auth::UserRefreshCredentials do
       end
     end
   end
-  end
 end