Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/platform/graphics/Extensions3D.h

Index: Source/core/platform/graphics/Extensions3D.h
diff --git a/Source/core/platform/graphics/Extensions3D.h b/Source/core/platform/graphics/Extensions3D.h
index b1ddf791533f3b4b3f4a8081e6ba0586403637fd..cd51baa6dd6b2ccac248f234d4c60297ef5d7edf 100644
--- a/Source/core/platform/graphics/Extensions3D.h
+++ b/Source/core/platform/graphics/Extensions3D.h
@@ -115,13 +115,13 @@ public:
 
         // GL_EXT/OES_packed_depth_stencil enums
         DEPTH24_STENCIL8 = 0x88F0,
-        
+
         // GL_ANGLE_framebuffer_blit names
         READ_FRAMEBUFFER = 0x8CA8,
         DRAW_FRAMEBUFFER = 0x8CA9,
-        DRAW_FRAMEBUFFER_BINDING = 0x8CA6, 
+        DRAW_FRAMEBUFFER_BINDING = 0x8CA6,
         READ_FRAMEBUFFER_BINDING = 0x8CAA,
-        
+
         // GL_ANGLE_framebuffer_multisample names
         RENDERBUFFER_SAMPLES = 0x8CAB,
         FRAMEBUFFER_INCOMPLETE_MULTISAMPLE = 0x8D56,
@@ -133,7 +133,7 @@ public:
         // GL_OES_rgb8_rgba8 names
         RGB8_OES = 0x8051,
         RGBA8_OES = 0x8058,
-        
+
         // GL_OES_vertex_array_object names
         VERTEX_ARRAY_BINDING_OES = 0x85B5,
 
@@ -248,13 +248,13 @@ public:
     // returning the same error. Restoring the GraphicsContext3D is handled
     // externally.
     int getGraphicsResetStatusARB();
-    
+
     // GL_ANGLE_framebuffer_blit
     void blitFramebuffer(long srcX0, long srcY0, long srcX1, long srcY1, long dstX0, long dstY0, long dstX1, long dstY1, unsigned long mask, unsigned long filter);
-    
+
     // GL_ANGLE_framebuffer_multisample
     void renderbufferStorageMultisample(unsigned long target, unsigned long samples, unsigned long internalformat, unsigned long width, unsigned long height);
-    
+
     // GL_OES_vertex_array_object
     Platform3DObject createVertexArrayOES();
     void deleteVertexArrayOES(Platform3DObject);