Consolidate most simple vs. complex Font methods

Source/platform/fonts/GlyphBufferTest.cpp

Index: Source/platform/fonts/GlyphBufferTest.cpp
diff --git a/Source/platform/fonts/GlyphBufferTest.cpp b/Source/platform/fonts/GlyphBufferTest.cpp
index 23bb5b96e22551bf10c65708bd4c5e576a22f02e..d03c74de8c14760c5b3a74f9a098dc60c99f01d9 100644
--- a/Source/platform/fonts/GlyphBufferTest.cpp
+++ b/Source/platform/fonts/GlyphBufferTest.cpp
@@ -50,6 +50,7 @@ TEST(GlyphBufferTest, StoresGlyphs)
     glyphBuffer.add(44, font2.get(), 12);
 
     EXPECT_FALSE(glyphBuffer.isEmpty());
+    EXPECT_FALSE(glyphBuffer.hasOffsets());
     EXPECT_EQ(3u, glyphBuffer.size());
 
     EXPECT_EQ(42, glyphBuffer.glyphAt(0));
@@ -67,18 +68,15 @@ TEST(GlyphBufferTest, StoresOffsets)
     RefPtr<SimpleFontData> font1 = TestSimpleFontData::create();
     RefPtr<SimpleFontData> font2 = TestSimpleFontData::create();
 
-    GlyphBufferWithOffsets glyphBuffer;
+    GlyphBuffer glyphBuffer;
     glyphBuffer.add(42, font1.get(), FloatSize(10, 0), 0);
     glyphBuffer.add(43, font1.get(), FloatSize(15, 0), 0);
     glyphBuffer.add(44, font2.get(), FloatSize(12, 2), 0);
 
     EXPECT_FALSE(glyphBuffer.isEmpty());
+    EXPECT_TRUE(glyphBuffer.hasOffsets());
     EXPECT_EQ(3u, glyphBuffer.size());
 
-    EXPECT_EQ(FloatSize(10, 0), glyphBuffer.offsetAt(0));
-    EXPECT_EQ(FloatSize(15, 0), glyphBuffer.offsetAt(1));
-    EXPECT_EQ(FloatSize(12, 2), glyphBuffer.offsetAt(2));
-
     const FloatSize* offsets = glyphBuffer.offsets(0);
     EXPECT_EQ(FloatSize(10, 0), offsets[0]);
     EXPECT_EQ(FloatSize(15, 0), offsets[1]);